I just bought someone's attempt at building one hopeing to find videos half as clear as yours and found you. Everything explained clearly complete with personal tricks and tips. You've made my backyard mechanical abilities easily transferable to these neat little motors. Thank you. Bet I'm driving by the end of the day now 😁
I put together my first motorized bike recently and before I did anything I checked youtube for videos on how to build a motorbike Hughes videos are great he gives all the info. simple easy to understand and covers all the details I couldn't have done it without your help keep making those videos you da man thanks for all your help J.Cote SanDiego CA.
I got into the hobby in the first week of May '19. I built and sold six bikes that summer. Today is June 30, 2020. I have built and sold six more that put $2050 PROFIT in my pocket. (this season alone) I've done one consignment build. My bikes all run 28t sprockets. The last bike sold went 51mph. 26" Huffy middle weight beach cruiser. 28t. 26x1.75 Goodyear tires @40psi. Well greased wheel bearings and a Thruster F2 pipe. 16-1 a sip of 108 booster and STP 2cycle oil.
Where would you recomend I order an engine kit from ? I would like to keep it limited to around $ 180.00 or so but there are so many sellers now a days! I would prefer 8 M M studs and better engine bolts I know that!
Attention! This guy knows his stuff! One thing overlooked and most do miss on these carbs, is the actual needle length may differ from one carb to the next, Common issue is the little E clip wears out the needle where it seats, you may find you set it in the middle groove after a month of solid riding it has worn to the second groove, This is caused by the needle bottoming out to hard on the jet causing the spring to push against the clip slowly wearing it, About the only solution I came up with so far is swapping out to a gentler spring, A progressive spring I McGyver'd up by gently heating the first couple coils on a spring to relax it's tensile strength a bit. This allows a weaker pressure at closed throttle and gets stiffer as opening, it's a balance lol Yes I trashed a few getting it right or close enough I do not get wear anymore 😊 Cheers Mate for some great videos
Thank you for creating this content and teaching me something new it’s like having my father back unfortunately he passed away when I was a younger kid
Ratatacoon when you have a great teacher, you can learn anything at all with ease. All depends on the person teaching. That's key. And this guy is a fantastic teacher. He was born for this.
At some point you'll have more of a grasp on how long a year actually is, probably when you've had more breakfasts than your going to have. Way less than a million no doubt
I have this carb on my huasheng 49cc and I've had some trouble tuning it. its running the best so far with a 75 jet and the clip at the bottom of the needle. if i give it full throttle all at once it'll die unless I'm already going half throttle then it will sputter a bit then take off. you explained how the carb works like a pro. you just got a sub sir.
I love watching your repair videos about carburetors and motors you're very informative I'm a newbie and you make things real easy thank you for being you
I have used these carburetors before and had float troubles and gas poring out. Now you have told us all how to fix the problems this is a great Video and your my online mechanic. Thank you so much for sharing. And saving me time and money! I have built 6 bikes and sold 2. Now I can start rebuilding my old carburetors!
sorry. Just noticed your comment. a 65 or 67 will do. jet kits are hard to come by lately. You can fill w/ solder and drill out w/ a pin vise and micro drills
How much it can be assured that the fuel intake will do starting without the prime bulb to ease starting. Needs starting fluid spray into the carburetor all the time to start? Please explain clear this for me. Awaiting answer please. Good video you posted. Thanks.
Thanks for your video about NT carburetor. I installed one but just will not start. I saw the spark plug tester light did light up. The choke was closed. Just can not figure out where air leaks and why motor not fire up running. Frustrating and suggestions please. Can you know what other type of carburetor that is better than the NT carburetor that has primer bulb to ease starting.
I tried the so called "racing" carburetor for the stage 4 66cc 2stroke BBR TUNING I bought two Jets + and - from what they are setup with. I COULD NOT match the speed of the NT carburetor that was properly set up.
Honestly this videos just completely amazing it just taught me how to rebuild carburetors so amazing man love your videos thanks for sharing your knowledge with us man & for free these bikes are so much fun haha
man i like your videos you dont pull punches or try to sugar coat things . i have two bikes both run the little antique carbs never had a issue with them . not even why i like your videos though its more of the first thing i said tell it like it is dont worry about hurting feelings and you dont make a full course meal out of a apple if you know what i mean . good stuff . i subbed and rang that bell .
Tuning. To get the 80cc engine to run in 2 cycle mode. Changing Main Jet size. Most engines come with a #70 jet which in most cases is just to rich. Here in Mid Michigan I am at 774 ASL. A #65 was richer. What I have noticed is the #60 is the largest hole and the #80 the smallest. With the stock jet the rich setting gives a lot of torque but in 4 stroke, up to speed then I back off the throttle, the engine clears and starts to run in 2 cycle. Adding a bit of throttle the engine will produce a pop sound from the exhaust and will run rougher. Back off the throttle a tad the engine smooths out, gets quieter, and power comes up. I have tried several different sizes of jets. # 72 and # 74 are next on the list to try. My next thing to try is adding a "Walbro" carb so I can adjust the jets with a screwdriver. This is the carb that is found on chainsaws, weedeaters, backpack blowers and other 2 cycle engines, it has BOTH High and Low needle screws. I fly R/C airplanes and have a 3 CID 2 cycle engine running with a Walbro carb. This engine spins a 14 x 6 MAS prop. Fuel mix is 92 oct, with the Stehl Chainsaw engine oil. mixed to 40 - 1.This is my standard fuel mix for all my 2 cycle engines. I am running a "Zeda Firestorm", with tuned pipe, big heat sink high compression head, the big box type reed valve. This is a minor carb problem I'm working on. This seems to be one subject that all of the articles on the net concerning Gasbike engines just doesn't address. I don't know why but when I listen to a Gasbike engine run and it's running to 4 stroke just BOTHERS me .Smooth running high power 2cycle running strong, like in a chainsaw, is what these engines should sound like and running smooth. From here in Michigan KEITH
What happened to the Speed versión of the NT carburetor? You know, the one with the red plastic thing. I cant find it online in any web that ships to Europe. Is there any other NT high performamce carburetor for these bikes?
good video on NT slide valve carb. I've got one coming to replace the stock carb on my 49CC 4 stroke. I failed to rinse the junk out of the new gas tank , it clogged everything, there are passageways that can't be cleared without drilling out the brass welch plugs to get access to hidden jets and orifices. The stock carb was fine until the junk got into it, H124C carb. I tried carb cleaner, ultrasonic bath, compressed air, no dice. When the NT carb arrives I'm gonna drill the welch plugs out and see what the problem was.
Question. I am new to this hobby and just completed first build. It fired up and ran good. Now when I try to run it the back wheel won't spin when I engage the clutch to start it after pedaling. Almost like there is no spark to push the piston. Any ideas as to why it won't start
I put expansion chamber, new head, and a different foam filter in, it was 4 stroking pretty bad, made one adjustement to the clip position and idle screw, runs fabulously now when warmed up. also running approx 35 to 1 synthetic blend 2 cycle oil
i always go back to your video when i have a problem . question on the side of my carbertor it says bo fong what type jets .work with what i have. thank you.
The indepthness to your explanations are *Next-Level. I calculate tremendous success in your UA-cam career! Don't give up... You were born for this! PHENOMENAL demonstration and clear concise teachable moment. Great work my friend. Great work.
This is incredibly helpful, Thank you! I have learned so much from trial and error with these bikes. This video is really helpful. My bike is bogging at full throttle, at about 1/4 to 1/2 is where it goes the fastest. After watching your video, Its safe to assume it's probably the jet Right? Thanks again for this video. Looking forward to watching your others.
What's your mix ratio? Have you done a half throttle plug burn to see how it burns there? If it's black and nasty it's running way to rich and start by adjusting your mix slowly, Then go about changing jets, get your mix right first to your driving area, one thing I noticed not really talked about correctly is mix does play a factor in your tune before you start to jet, my mix tune for half throttle may be richer than what you need, or leaner depending on altitude, humidity, mix oil, and gas, . Always start out rich and ween your motor off the oil slowly and do a plug burn at half throttle to check it, black is rich, Brown is good but wee bit rich, White or pale grey, to lean get some oil in there fast lol. Personally I like mine just a tad on the browser side, gives life and longevity , once I get that I tune the jet and again I do plug burns at full throttle to check. Then adjust my jet accordingly. I sit with a 68 in my carbs. Oh a plug burn,, Hold throttle at point where you want to read the plug for 10 second count, then hit kill switch and shut motor down and release throttle at sametime. Shut fuel of and do not touch throttle again until you pull the plug and look at it. 👍
Mix ratio for oil to gas,, Richer mix more oil, good on break in lubes everything and runs engine cooler, can foul plug and cause 4stroking or firing on every other stroke Leaner mix less oil, after break in, more power, runs hotter, no foul plugs and no 4 stroking
Awesome detailed explanation with visuals. My throttle handle doesn't seem to be springing back when I twist it. What would most likely cause that and will it be a big issue if left like that? Thanks.
so if im correct theres trash or some debris in the hole where the fuel go in for me, my bike when i started it yesterday i had to give it more throttle then usual because if i don’t the bike would pull back.
hey Boss I really appreciate the knowledge Is could not have gotten from point A without your visuals I swear it!! My question is Is it alright to slow the bike using the kill switch until I get a brake put on there Sir because it just feels wrong you know like I am really not suppose to slow down this way
Hello thanks for all the help with all your videos , I have a bt100 100cc engine , do you think it will benefit from a bigger carb even though it is all stock (just baffle cut from exhaust) thank you
Probably not. A properly jetted stock carb would be best. Port cleanup, expansion chamber follwed by jetting to adjust for the changes. If you have a balanced crank and a reed along with advanced porting? then yes, a bigger carb would help
question for you: if Im at altitude (colorado) should I try to run it leaner by moving the needle clip lower so I get more air? I dont know shit about engines
I'm running a 4 stroke 49cc 142F. I changed to the NT, but no matter what I do, it runs rich. Running a jet i modded with solder and a needle that"s less than the smallest jet I have which is #61. Clip at top of needle. (Leanest) Do a plug chop, and it's black. I am just about to put the stock carb back on. Hoping you'll answer soon. Gonna go try to make an even smaller jet. I live in Central FL BTW, so everything I've read and seen says I should be good with the #61, but it's too rich. I've looked everywhere. Please help.
@@HughesMotorized Thank You for the quick response. Yes, unfortunately I concur. I ordered all 3 original green gaskets, cut the excess off of the screw that holds the throttle plate, dremeled down the inner light grey plastic on the choke plate, slightly widened the jet, and took off the welch plug to access the fuel/air idle mix. Hopefully, when I put it back on it won't be running as lean. Was idling too high, but then gargles at full throttle w/ stock carb. Plug chop reveals a grey/white plug. This is why I changed in the first place. This is the 2nd carbI bought. The first one was an HP for $28, then when that didn't work, I got an NT ($10) because I already bought the intake peice and wanted to use it. Now, it's just a waste of money as the intake + 2 carbs + new gaskets + jets = $70!!! Not to mention my patience wearing extremely thin. I want it to sound like this: ua-cam.com/video/U7Au3f3Zt9I/v-deo.html&lc=UgyEWwTNXBi5iGAIv1h4AaABAg.97HhRpvAIMj99E6rzQRVth
I just recently bought a bike with one of these motors already on it. It sat in a barn for about a year. I drained the fuel out of the tank and replaced the fuel lines and filter. It has a new spark plug as well. When I try to run it, it seems like it wants to bog down and it doesn't idle when I'm still. When I give it gas, it also wants to shut off. Would drilling holes in the air filter work along with adjusting the idler screw? Any tips are appreciated.
These carburetors don't have an idle jet like a motorcycle carburetor does. I saw you say here's the jet that supplies the fuel and here is the idle jet what are you actually referring to?
That carb reminds me of the twin S U carbs on a Datsun 240z from the early 1970’s, they too were side draft carbs, however they needed mineral oil to function correctly! Now my question is do you recommend any 4 stroke kits for a “work Bike” vs a neighborhood terror machine!
The Lifan 152 is a 97cc motor that runs good if you advance the timing a hair. Make your own "kit" amzn.to/2L23Uq8 And there's always the Huasheng 49cc - amzn.to/3b0Nb13
I am grateful for video but I dissamble my carburator an it is in perfect shape.Can you please tell me how manny percent of oil goes in two stroke engine. I will appreciate your answer
I'm about ready to rip my hair out trying to find a replacement E clip (circlip?) for my carb needle on a red "true speed carb". I tried Ace and the smallest they even had was 1/4". Lowes had 5/32" which was still too large, and Home Depot had down to 1/8" which is just barely too big. Going to try Harbor Freight as a last resort before ordering online. At the very least, what size should I be looking for? I don't have any calipers to measure with at the moment, unfortunately. If anyone in the community knows and could let me know, it'd be greatly appreciated!
Thanks for the info on fully seating the carb on the intake manifold. The carb "seemed" to be fully seated because the carb was resting on the ridge of the manifold. It turns out I had to expand the carb flanges so they would go over the ridge in order to get a full seat. Now it runs great!
You put a link for the Jets in here, but they do not have a 66 and you say all the way through the video on number 66 jet is the best for most, give us a link that includes a 66 jet, thanks
i just built a bike purchased from bikeberry it is a bbr tuning 2 stroke motor and i thought i had a nt carb i watched your video on the nt carb and ordered the 5mm jet set you recomended well i just discovered i have the bofeng carb and jets are not 5mm.please any information you can impart to my dumb ass on tuning and set up will be so helpfull.
I have a question about the carburetors. What would be the cause of my carburetor leaking from the idle screw? It's my 2nd carb that had this problem. I live in the city so bumps and potholes are a thing. Maintenance wise I just do basic stuff and these little motors last for hundreds of miles.
I've actually got a comment I was wondering if you could do a video on the shark head for the motorized bikes I have one but I can't seem to make it work right Is there any hints or tips I could do
what issue were you having? One can swap out the heads and go without any tuning. Of course a plug chop and adjust the jetting will get you best results.
No. The issue is the Main Jet. It is too rich. The Main Jet handles from 3/4 to full open throttle and they intentionally have it rich from the factory as the extra fuel helps lubricate and cool things off. Not so good for performance but they are mostly interested in keeping the engine running thru the warranty period. Removing the air filter helps lean it out some but still needs like a #66 jet
I missed something. Just how does the pin at the end of the throttle cable regulate fuel flow? I can see that it slides in and out of the jet tube, but how does it affect the flow. Does it uncover holes in the side of the tube or something?
@@HughesMotorized Yes, the video says what the needle does, but does not explain HOW it does this. For instance, a needle valve that I'm familiar with increases flow by pulling a tapered pin out of a hole, increasing the area through which the fuel can flow. This needle does not look tapered, so how does it let more fuel flow as it's pulled up the tube? I'm not trying to be difficult, but I really want to know what's going on here. Thanks
@@Urugami45 Yes. It is tapered. www.google.com/search?q=nt+carb+needle&client=ms-android-google&prmd=isvxn&sxsrf=AOaemvJLZhUIkQAtAHIniYbE2XLmovw55w:1639845769449&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjk2MvE5e30AhWokokEHfr0ANAQ_AUoAXoECAIQAQ&biw=393&bih=730&dpr=2.75#imgrc=AqwaWz4Xfl1ZvM
OK, I see it now. I've seen this needle in a few videos before yours, and I couldn't tell it was tapered. I've seen it in a few vids since that it is indeed smaller at the end. Sorry for my confusion.
I just want to know why my bike doesn’t run anymore after i installed the Reed and windowed piston with this carb I need a better carb and this is not the best cause I tried different jets looks like I’m gonna have to buy the makuni vm18 with some jets to get this thing running
Great informative info. I also have been working on small hondas and such for years and agree with everything you said. Plus nice vid. No wasted time or a bunch of ugh. Ugh. Ugh. Like SO many vids have. Thank you sir. I found your site from a welding flux core vid you did. Good day Sir.
My carburator doesnt fit on my frame and I install the 4 tubes upside is there any problem of that because l trying to starter for first time and it doesnt tries to fire and then dies , already check spark and disconnect kill switch all it's fine but I'm wondering if the carburator filter with the tubes up it could be an issue on that...I'm running 93 gas on 40.1 Lucas
When I installed my motor I made sure that the carburetor went together correctly. However, it idles high and the idle screw has no effect on lowering the idle. I'm not running ritch or lean. Just won't idle down. It's not the NT. Any suggestions?
Double check and make sure your throttle cable isn't too tight. I had the same problem with one of my Motors. The routing of the cable took up more slack than I anticipated, and it caused a slight pull at idle, causing the high idle situation. The way I diagnosed it, was by loosening the throttle cable adjuster on top of the carburetor. When the idle went down, I knew that was the problem.
Hey I'm having a little problem with my motorized bicycle takes off smooth but when I pick up the speed it blubbers at the end of the top speed, I'm pretty sure their stock Jets so if I put a 66 jet I should be good
So it is ok to take the filter out and run my bike,I wish I could send you a picture of my bike,just got it a month ago,my pastor bought it for me,he got tired of me walking to work.
Doesn't you're jets make a difference on where you live ? like higher altitudes smaller jets ,also does the needle for the throttle need to be moved for altitude too ? on my bike it runs weak at top end and sounds like its struggling for fuel I have the 80ccZed triple 40
Are there any pumper carburetor intake manifolds for these bike kits? Id love to bolt on an HDA 43 tunable carb on it. I know they atomize fuel way better. And you can fine tune them way easier.
Hughes Motorized i took your advice. Heres my latest project. Let me know what you think? Its still a work in progress. ua-cam.com/video/wKVgXoGkscI/v-deo.html
@@xero_d4rkx650 I see now said the blind man. I've made one using tin snips to cut the circle out of 22ga steel and a hacksaw and small file to dress up the slot
OK I did everything the way you said and I'm still having a lean condition at full throttle...I look down at the carb and its blowing fuel out of it...and no I'm running no air filter...
If you take good care of it and correctly mix the oil to gas ratio(not too rich nor lean)keep everything good and tight,replace the rings every couple years.......it can last many yrs and alot of miles
@@darkkonblackblade6161 Amen .Yet that's assuming the bottom end is somewhat decently balanced and the cylinder's chrome bore holds up. They are making the chrome bore thinner and thinner nowadays
Here is my GREAT way of solving the air leak issue.... wrap the manifold with a few layers of yellow plumber's tape, get the carb snugly on, ditch the stock clamp altogether and use a hose clamp from the hardware store, and get it decently tight and you won't be having any leaks there for sure! EDIT: The stock "hose" clamp is terrible. In my case, it didn't squeeze strong enough to keep the carb from flying OFF the manifold [this happening because when the piston goes down and closes the intake port, all the fuel and air coming through the manifold suddenly hits a wall, literally, and this causes tremendous back pressure, which blew my carb off].
Yeah dude. The crap "steel" screw they give you will start to buckle and eventually snap. I went with the same clamp but swapped the screw for a good steel Allen bolt. Works way better. But as to taping the tip there...I figured that was necessary. I'm shocked it's not in the instructions. I even went a step further putting oil resistant gasket sealer on the slot. It works great
@@gyromurphy Speaking of replacing the crap screw with a quality Allen one, that's actually a good tip for EVERY SCREW ON THE WHOLE KIT WHEREVER POSSIBLE. I just wanted to throw that out there for whoever is reading :D
quick question is my first time trying to start up my motorized bicycle I leave the choke open soon as it starts up I close the choke but the engine shuts off why is that?
These engines must be coaxed into running at first. I'll pull up on choke lever to start and if it's cold outside, I'll slowly push it down as engine warms up. I'll vary the throttle to keep engine going and take off to warm engine up.
My bike (80cc/100cc Chinese) throttles really really high when the clutch is engaged. Otherwise it runs great. I've troubleshooted everything to the point I just bought a brand new carb and it does the exact same thing. I've covered every possible air leak with a cocoon of gasket sealer...still, throttles really high. Does anyone have any idea what on Earth the issue could be?
I'm trying to figure out what my problem is since I recently replaced my top end with one of the new 40mm intake jugs with the open teansfers- I absolutely cannot get it leaned out enough! I've got the smallest jet I think stock is .60mm? Which has always worked for my setup in summer- I've got the needle clio adjusted but I'm still showing and running rich enough to foul my plugs after about 30min of run time. Anyone have any ideas? It obviously has something to do with that new jug I just cant figure out what exactly it is.
I always port but I took it off and ported a bit more extreme, added TWO more bottom gaskets, then took 2mm off the deck to maintain squish but it only helped a bit.
I live at the 760 ft above sea level. I've got a stock 80cc 2 stroke with the NT carb. At the moment I'm still running 16:1 fuel mix with 1 more tank to go. What size jet should I run at this altitude and what groove on the pin? Thank You.
@@HughesMotorized Thank You Sir. The carb came with a #65 and I've experimented with #60 and #70. I'll try the #65 again. I've added an after market CDI and NGK plug since the last time running the #65. I'll keep you posted
@@HughesMotorized I installed #65 jet and clip is on 3rd groove. The bike rides like a bandit. I haven't done the plug chop yet. This is the best it has run . Thanks again.
my 80cc motorized bike was running great until it just bogged out on the way home from the gas station. I do not think it is an aelectical issue like the plug because i turned on the choke and it started but then shut off.
Thank God for natural teachers like Mr Hughes!
I just bought someone's attempt at building one hopeing to find videos half as clear as yours and found you. Everything explained clearly complete with personal tricks and tips. You've made my backyard mechanical abilities easily transferable to these neat little motors. Thank you. Bet I'm driving by the end of the day now 😁
Glad I could help! Momma said they'd never find me handsome so at least let them find you handy boy !
I put together my first motorized bike recently and before I did anything I checked youtube for videos on how to build a motorbike Hughes videos are great he gives all the info. simple easy to understand and covers all the details I couldn't have done it without your help keep making those videos you da man thanks for all your help J.Cote SanDiego CA.
That is awesome!
I can't put a money figure on the joy these little motors have given me. I have several bikes.
Amen brother. Fun stuff. lots o pain when they are stubborn, but that forces me not only to cuss but to learn a little
Hughes Motorized well said brother
I got into the hobby in the first week of May '19. I built and sold six bikes that summer. Today is June 30, 2020. I have built and sold six more that put $2050 PROFIT in my pocket. (this season alone)
I've done one consignment build. My bikes all run 28t sprockets. The last bike sold went 51mph. 26" Huffy middle weight beach cruiser. 28t. 26x1.75 Goodyear tires @40psi. Well greased wheel bearings and a Thruster F2 pipe. 16-1 a sip of 108 booster and STP 2cycle oil.
Where would you recomend I order an engine kit from ? I would like to keep it limited to around $ 180.00 or so but there are so many sellers now a days! I would prefer 8 M M studs and better engine bolts I know that!
Eric McGinnis check Amazon
Attention! This guy knows his stuff! One thing overlooked and most do miss on these carbs, is the actual needle length may differ from one carb to the next,
Common issue is the little E clip wears out the needle where it seats, you may find you set it in the middle groove after a month of solid riding it has worn to the second groove,
This is caused by the needle bottoming out to hard on the jet causing the spring to push against the clip slowly wearing it,
About the only solution I came up with so far is swapping out to a gentler spring, A progressive spring I McGyver'd up by gently heating the first couple coils on a spring to relax it's tensile strength a bit. This allows a weaker pressure at closed throttle and gets stiffer as opening, it's a balance lol
Yes I trashed a few getting it right or close enough I do not get wear anymore 😊
Cheers Mate for some great videos
Regarding springs, I haven't had to do it, but I think it'd be possible to jerry rig it with an ink pen's spring (the clicking pens, of course).
Thank you for creating this content and teaching me something new it’s like having my father back unfortunately he passed away when I was a younger kid
never in a million years did I think my tiny teenage know it all brain would have the capacity to understand how carburetors and clutches work
Ratatacoon when you have a great teacher, you can learn anything at all with ease. All depends on the person teaching. That's key. And this guy is a fantastic teacher. He was born for this.
The DADDi Project true, I thought math would forever be ancient Mongolian manuscript but my 9th grade teacher was really good
he's a good explainer, that's gotta be said
Ratatacoon lmao! Too funny. Thanks for that
At some point you'll have more of a grasp on how long a year actually is, probably when you've had more breakfasts than your going to have. Way less than a million no doubt
I have this carb on my huasheng 49cc and I've had some trouble tuning it. its running the best so far with a 75 jet and the clip at the bottom of the needle. if i give it full throttle all at once it'll die unless I'm already going half throttle then it will sputter a bit then take off. you explained how the carb works like a pro. you just got a sub sir.
I had some issues w/ the NT on the 49cc and have stuck w/ the stock carb as it gave me less issues
I love watching your repair videos about carburetors and motors you're very informative I'm a newbie and you make things real easy thank you for being you
Glad to help
I have used these carburetors before and had float troubles and gas poring out. Now you have told us all how to fix the problems this is a great Video and your my online mechanic. Thank you so much for sharing. And saving me time and money! I have built 6 bikes and sold 2. Now I can start rebuilding my old carburetors!
Question? 7:04 you say jet 66 I cant find that jet set with a 66
THIS!! So confused! haha
sorry. Just noticed your comment. a 65 or 67 will do. jet kits are hard to come by lately. You can fill w/ solder and drill out w/ a pin vise and micro drills
@@HughesMotorized thank you
Thank you thank you thank you. I’ve been searching 1000’s of useless video. You have made an excellent video that is very easy to follow.👍👍
If you all want to really know what works and doing it the right way,watch this channel,this guy knows what he is talking about
Thanks. And thanks for watching !
I've got to say... you have the best t-shirts around.
I have at least 100. never worry about a clean-ish shirt
How much it can be assured that the fuel intake will do starting without the prime bulb to ease starting. Needs starting fluid spray into the carburetor all the time to start?
Please explain clear this for me.
Awaiting answer please.
Good video you posted. Thanks.
No need to spray. A primed carb in working condition and the choke in start position is all you need
Thanks for your video about NT carburetor.
I installed one but just will not start. I saw the spark plug tester light did light up. The choke was closed. Just can not figure out where air leaks and why motor not fire up running. Frustrating and suggestions please.
Can you know what other type of carburetor that is better than the NT carburetor that has primer bulb to ease starting.
NTs are great carbs. Is the spark plug wet w/ gas after trying to start?
Great video.... I’ll have to change my jet to #66 .... love these carbs.... these other ones are junk.... IM A BIG FAN OF THE NT CARBURETOR...!!!!
Right on
I tried the so called "racing" carburetor for the stage 4 66cc 2stroke BBR TUNING I bought two Jets + and - from what they are setup with. I COULD NOT match the speed of the NT carburetor that was properly set up.
Honestly this videos just completely amazing it just taught me how to rebuild carburetors so amazing man love your videos thanks for sharing your knowledge with us man & for free these bikes are so much fun haha
Thank you!
man i like your videos you dont pull punches or try to sugar coat things . i have two bikes both run the little antique carbs never had a issue with them . not even why i like your videos though its more of the first thing i said tell it like it is dont worry about hurting feelings and you dont make a full course meal out of a apple if you know what i mean . good stuff . i subbed and rang that bell .
Thanks! Right on
your videos are the best on youtube for this kind of stuff
Why thank you. I try
Tuning. To get the 80cc engine to run in 2 cycle mode.
Changing Main Jet size.
Most engines come with a #70 jet which in most cases is just to rich. Here in Mid Michigan I am at 774 ASL.
A #65 was richer. What I have noticed is the #60 is the largest hole and the #80 the smallest. With the stock jet the rich setting gives a lot of torque but in 4 stroke, up to speed then I back off the throttle, the engine clears and starts to run in 2 cycle. Adding a bit of throttle the engine will produce a pop sound from the exhaust and will run rougher. Back off the throttle a tad the engine smooths out, gets quieter, and power comes up. I have tried several different sizes of jets. # 72 and # 74 are next on the list to try.
My next thing to try is adding a "Walbro" carb so I can adjust the jets with a screwdriver. This is the carb that is found on chainsaws, weedeaters, backpack blowers and other 2 cycle engines, it has BOTH High and Low needle screws.
I fly R/C airplanes and have a 3 CID 2 cycle engine running with a Walbro carb. This engine spins a 14 x 6 MAS prop.
Fuel mix is 92 oct, with the Stehl Chainsaw engine oil. mixed to 40 - 1.This is my standard fuel mix for all my 2 cycle engines.
I am running a "Zeda Firestorm", with tuned pipe, big heat sink high compression head, the big box type reed valve. This is a minor carb problem I'm working on.
This seems to be one subject that all of the articles on the net concerning Gasbike engines just doesn't address. I don't know why but when I listen to a Gasbike engine run and it's running to 4 stroke just BOTHERS me .Smooth running high power 2cycle running strong, like in a chainsaw, is what these engines should sound like and running smooth.
From here in Michigan KEITH
What happened to the Speed versión of the NT carburetor? You know, the one with the red plastic thing. I cant find it online in any web that ships to Europe. Is there any other NT high performamce carburetor for these bikes?
Thank you so much honestly your amazing at teaching love these videos hope they never stop haha thanks a lot man your amazing
Glad you like them!
good video on NT slide valve carb.
I've got one coming to replace the stock carb on my 49CC 4 stroke.
I failed to rinse the junk out of the new gas tank , it clogged everything, there are passageways that can't be cleared without drilling out the brass welch plugs to get access to hidden jets and orifices.
The stock carb was fine until the junk got into it, H124C carb.
I tried carb cleaner, ultrasonic bath, compressed air, no dice.
When the NT carb arrives I'm gonna drill the welch plugs out and see what the problem was.
HUGHES SIMPLY THE BEST. .WELL DONE
Question. I am new to this hobby and just completed first build. It fired up and ran good. Now when I try to run it the back wheel won't spin when I engage the clutch to start it after pedaling. Almost like there is no spark to push the piston. Any ideas as to why it won't start
Your video it helped me a whole lot more than most videos did
I put expansion chamber, new head, and a different foam filter in, it was 4 stroking pretty bad, made one adjustement to the clip position and idle screw, runs fabulously now when warmed up. also running approx 35 to 1 synthetic blend 2 cycle oil
i always go back to your video when i have a problem . question on the side of my carbertor it says bo fong what type jets .work with what i have. thank you.
If it looks the same as the carb in the video then 5mm jets. Other than that I can only guess
you mentioned 66 jet at sea level I'm at 7600 feet what's your recommendation
Good video, should have named it carburetors for dummies, you covered it all
The indepthness to your explanations are *Next-Level. I calculate tremendous success in your UA-cam career! Don't give up... You were born for this! PHENOMENAL demonstration and clear concise teachable moment. Great work my friend. Great work.
Thanxx! I try. I'm a decent host but my camera/video skills are lacking. I'm hoping to improve
Hughes Motorized With natural talent comes natural improvement. I’m sure you’ll be just fine.
This is incredibly helpful, Thank you! I have learned so much from trial and error with these bikes. This video is really helpful. My bike is bogging at full throttle, at about 1/4 to 1/2 is where it goes the fastest. After watching your video, Its safe to assume it's probably the jet Right? Thanks again for this video. Looking forward to watching your others.
What's your mix ratio?
Have you done a half throttle plug burn to see how it burns there? If it's black and nasty it's running way to rich and start by adjusting your mix slowly,
Then go about changing jets, get your mix right first to your driving area, one thing I noticed not really talked about correctly is mix does play a factor in your tune before you start to jet, my mix tune for half throttle may be richer than what you need, or leaner depending on altitude, humidity, mix oil, and gas, .
Always start out rich and ween your motor off the oil slowly and do a plug burn at half throttle to check it, black is rich, Brown is good but wee bit rich, White or pale grey, to lean get some oil in there fast lol.
Personally I like mine just a tad on the browser side, gives life and longevity , once I get that I tune the jet and again I do plug burns at full throttle to check. Then adjust my jet accordingly. I sit with a 68 in my carbs.
Oh a plug burn,,
Hold throttle at point where you want to read the plug for 10 second count, then hit kill switch and shut motor down and release throttle at sametime. Shut fuel of and do not touch throttle again until you pull the plug and look at it.
👍
@@SandmanOG how does one adjust mix ratio?
what are you talking about, its no good if you aren't specific.
Mix ratio for oil to gas,,
Richer mix more oil, good on break in lubes everything and runs engine cooler, can foul plug and cause 4stroking or firing on every other stroke
Leaner mix less oil, after break in, more power, runs hotter, no foul plugs and no 4 stroking
Plenty 2stroke mix ratio charts out on web to look at I use Motul chart myself. 16:1 break in,, after 30:1
Andy Boosey u use 30:1 I only do 20:1
Awesome detailed explanation with visuals. My throttle handle doesn't seem to be springing back when I twist it. What would most likely cause that and will it be a big issue if left like that? Thanks.
Would it still start if not having the throttle cable in right I put a new carberater on my 80cc
so if im correct theres trash or some debris in the hole where the fuel go in for me, my bike when i started it yesterday i had to give it more throttle then usual because if i don’t the bike would pull back.
Does the carb need to be level to work right
You you're awesome brother I love watching your videos you break it down so easy and even an idiot like myself can understand I appreciate you brother
hey Boss I really appreciate the knowledge Is could not have gotten from point A without your visuals I swear it!! My question is Is it alright to slow the bike using the kill switch until I get a brake put on there Sir because it just feels wrong you know like I am really not suppose to slow down this way
Engine needs lubrication and when you slow it that way you are restricting the fuel/oil mix. Never did it long term
is the needle tapered? and is that what allows the increase/decrease of flow?
What kind of carb would you get for a engine that has a high compression head and a read valve? Thank yoy
Hey man I have a 80cc motor would this carby be good or would I need to get a different one
Hi hues. Should I go with a chain or friction drive. For My first build? Stanton. Or triple 40 kit ? Or China girl 66? I'm thinking. Thank you bill
thank you for your help. Mission accomplished. Carburetor demystified.
Hello thanks for all the help with all your videos , I have a bt100 100cc engine , do you think it will benefit from a bigger carb even though it is all stock (just baffle cut from exhaust) thank you
Probably not. A properly jetted stock carb would be best. Port cleanup, expansion chamber follwed by jetting to adjust for the changes. If you have a balanced crank and a reed along with advanced porting? then yes, a bigger carb would help
Does the carb need to be level to work right my bike will ldol ok but when I give it gas it dies and the carb is not level does it need to be level
question for you: if Im at altitude (colorado) should I try to run it leaner by moving the needle clip lower so I get more air? I dont know shit about engines
I have a oko pwk carb but it don't idle and bogs out the motor is upgraded with stuff u think might be clip it seems rich
I very much appreciate your love for sharing knowledge.
I'm running a 4 stroke 49cc 142F. I changed to the NT, but no matter what I do, it runs rich. Running a jet i modded with solder and a needle that"s less than the smallest jet I have which is #61. Clip at top of needle. (Leanest) Do a plug chop, and it's black. I am just about to put the stock carb back on. Hoping you'll answer soon. Gonna go try to make an even smaller jet. I live in Central FL BTW, so everything I've read and seen says I should be good with the #61, but it's too rich. I've looked everywhere. Please help.
I had some issues w/ the NT carb on that one. I use the stock carb on the 142F
@@HughesMotorized Thank You for the quick response. Yes, unfortunately I concur. I ordered all 3 original green gaskets, cut the excess off of the screw that holds the throttle plate, dremeled down the inner light grey plastic on the choke plate, slightly widened the jet, and took off the welch plug to access the fuel/air idle mix. Hopefully, when I put it back on it won't be running as lean. Was idling too high, but then gargles at full throttle w/ stock carb. Plug chop reveals a grey/white plug. This is why I changed in the first place. This is the 2nd carbI bought. The first one was an HP for $28, then when that didn't work, I got an NT ($10) because I already bought the intake peice and wanted to use it. Now, it's just a waste of money as the intake + 2 carbs + new gaskets + jets = $70!!! Not to mention my patience wearing extremely thin. I want it to sound like this: ua-cam.com/video/U7Au3f3Zt9I/v-deo.html&lc=UgyEWwTNXBi5iGAIv1h4AaABAg.97HhRpvAIMj99E6rzQRVth
I have four stroke 142f motor when I drive few kilometers clutch is rip off comming down matel and very hot tell me what reason thanks
I just recently bought a bike with one of these motors already on it. It sat in a barn for about a year. I drained the fuel out of the tank and replaced the fuel lines and filter. It has a new spark plug as well. When I try to run it, it seems like it wants to bog down and it doesn't idle when I'm still. When I give it gas, it also wants to shut off. Would drilling holes in the air filter work along with adjusting the idler screw? Any tips are appreciated.
Carb is gummed up. Jet is clogged. Needs a GOOD CLEANING or buy a new carb
These carburetors don't have an idle jet like a motorcycle carburetor does. I saw you say here's the jet that supplies the fuel and here is the idle jet what are you actually referring to?
That carb reminds me of the twin S U carbs on a Datsun 240z from the early 1970’s, they too were side draft carbs, however they needed mineral oil to function correctly!
Now my question is do you recommend any 4 stroke kits for a “work Bike” vs a neighborhood terror machine!
The Lifan 152 is a 97cc motor that runs good if you advance the timing a hair. Make your own "kit" amzn.to/2L23Uq8
And there's always the Huasheng 49cc - amzn.to/3b0Nb13
Where can I get a new float? Mine is somehow broken ...
amzn.to/30J7EFg get the whole carb and you'll have some spares
I am grateful for video but I dissamble my carburator an it is in perfect shape.Can you please tell me how manny percent of oil goes in two stroke engine. I will appreciate your answer
3.2 oz to a gallon of fuel
hey mr. texas what is the float drain screw washer made of (you know the red one)
It's made from a piecee of gasket material.
I'm about ready to rip my hair out trying to find a replacement E clip (circlip?) for my carb needle on a red "true speed carb". I tried Ace and the smallest they even had was 1/4". Lowes had 5/32" which was still too large, and Home Depot had down to 1/8" which is just barely too big. Going to try Harbor Freight as a last resort before ordering online. At the very least, what size should I be looking for? I don't have any calipers to measure with at the moment, unfortunately. If anyone in the community knows and could let me know, it'd be greatly appreciated!
Thanks for the info on fully seating the carb on the intake manifold. The carb "seemed" to be fully seated because the carb was resting on the ridge of the manifold. It turns out I had to expand the carb flanges so they would go over the ridge in order to get a full seat. Now it runs great!
Glad it helped
I learn new things everyday watching your video and stay safe and healthy 💯💯💕🛵ty for the
Thank you. take care
You put a link for the Jets in here, but they do not have a 66 and you say all the way through the video on number 66 jet is the best for most, give us a link that includes a 66 jet, thanks
i just built a bike purchased from bikeberry it is a bbr tuning 2 stroke motor and i thought i had a nt carb i watched your video on the nt carb and ordered the 5mm jet set you recomended well i just discovered i have the bofeng carb and jets are not 5mm.please any information you can impart to my dumb ass on tuning and set up will be so helpfull.
These jets will work amzn.to/41OtNAs #affilliate
I have a question about the carburetors. What would be the cause of my carburetor leaking from the idle screw? It's my 2nd carb that had this problem. I live in the city so bumps and potholes are a thing. Maintenance wise I just do basic stuff and these little motors last for hundreds of miles.
I've actually got a comment I was wondering if you could do a video on the shark head for the motorized bikes I have one but I can't seem to make it work right Is there any hints or tips I could do
what issue were you having? One can swap out the heads and go without any tuning. Of course a plug chop and adjust the jetting will get you best results.
@@HughesMotorized like did you grind the lip around the outside of the dome part of the head?
@@joshuamoon8442 No. No grinding
Great video of how the carburetor works, my bike is fouling plugs like crazy, is it a carburetor issue, thamks
What oil/fuel ratio? Too much oil can do that
would a slightly hotter plug fix the 4 stroking issue?
No. The issue is the Main Jet. It is too rich. The Main Jet handles from 3/4 to full open throttle and they intentionally have it rich from the factory as the extra fuel helps lubricate and cool things off. Not so good for performance but they are mostly interested in keeping the engine running thru the warranty period. Removing the air filter helps lean it out some but still needs like a #66 jet
Hey do you know how to make a 80cc engine shoot flames by turning up the carburettor
By making it run stupidly lean. Don't do it.
Love the Aqua teen hunger force tattoo.. that's hardcore.
I missed something. Just how does the pin at the end of the throttle cable regulate fuel flow? I can see that it slides in and out of the jet tube, but how does it affect the flow. Does it uncover holes in the side of the tube or something?
The needle lets in more fuel the higher it goes from 1/4 to 3/4 throttle. After 3/4 throttle it is the size of the jet that controls fuel
@@HughesMotorized Yes, the video says what the needle does, but does not explain HOW it does this. For instance, a needle valve that I'm familiar with increases flow by pulling a tapered pin out of a hole, increasing the area through which the fuel can flow. This needle does not look tapered, so how does it let more fuel flow as it's pulled up the tube?
I'm not trying to be difficult, but I really want to know what's going on here. Thanks
@@Urugami45 Yes. It is tapered. www.google.com/search?q=nt+carb+needle&client=ms-android-google&prmd=isvxn&sxsrf=AOaemvJLZhUIkQAtAHIniYbE2XLmovw55w:1639845769449&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjk2MvE5e30AhWokokEHfr0ANAQ_AUoAXoECAIQAQ&biw=393&bih=730&dpr=2.75#imgrc=AqwaWz4Xfl1ZvM
OK, I see it now. I've seen this needle in a few videos before yours, and I couldn't tell it was tapered. I've seen it in a few vids since that it is indeed smaller at the end. Sorry for my confusion.
@@Urugami45 All good. Look until you find concrete evidence. Helps one make better decisions
Anyone know where to get a replacement air filter and the assembly for it ,.. I’m in SoCal Rosemead, California
Run it open. You'll thank me. Had a kid run a bike no filter in Las Vegas. No issues several months later
I just want to know why my bike doesn’t run anymore after i installed the Reed and windowed piston with this carb I need a better carb and this is not the best cause I tried different jets looks like I’m gonna have to buy the makuni vm18 with some jets to get this thing running
Great informative info. I also have been working on small hondas and such for years and agree with everything you said. Plus nice vid. No wasted time or a bunch of ugh. Ugh. Ugh. Like SO many vids have. Thank you sir. I found your site from a welding flux core vid you did. Good day Sir.
Glad it was helpful!
My carburator doesnt fit on my frame and I install the 4 tubes upside is there any problem of that because l trying to starter for first time and it doesnt tries to fire and then dies , already check spark and disconnect kill switch all it's fine but I'm wondering if the carburator filter with the tubes up it could be an issue on that...I'm running 93 gas on 40.1 Lucas
Post some pics on my Facebook group and we'll see if we can help - facebook.com/groups/hughesmotorized
The intake upside down, or the entire carb?
please mr. hughes that darn drain screw washer leaks kind of bad . where can i get a new washer for that screw?
It's a specialty item. Not sold separately. The treads of the screw will seal it. Get a new screw and metal washer from HW store
When I installed my motor I made sure that the carburetor went together correctly. However, it idles high and the idle screw has no effect on lowering the idle. I'm not running ritch or lean. Just won't idle down. It's not the NT. Any suggestions?
Double check and make sure your throttle cable isn't too tight. I had the same problem with one of my Motors. The routing of the cable took up more slack than I anticipated, and it caused a slight pull at idle, causing the high idle situation. The way I diagnosed it, was by loosening the throttle cable adjuster on top of the carburetor. When the idle went down, I knew that was the problem.
My penney's mo-ped had a carburetor that was very similar
Hey I'm having a little problem with my motorized bicycle takes off smooth but when I pick up the speed it blubbers at the end of the top speed, I'm pretty sure their stock Jets so if I put a 66 jet I should be good
2 things. 1. Yes. Leaner jet will help. 2. The engine simply maxes out due to balancing and the like. That's what you are seeing
@@HughesMotorized hey thanks for your response , I'll give it a shot and I'm going to go with the 66 jet
So it is ok to take the filter out and run my bike,I wish I could send you a picture of my bike,just got it a month ago,my pastor bought it for me,he got tired of me walking to work.
Remove the filter and you'll be fine. I have someone in Las Vegas desert running fine without a filter.
Do you mean 65 jets cause I can't find any that say 66
a 65 would be fine. Some kits have them, some don't a 65 to 68 should work about the same
can you put another link for the carburetor because that was not working anymore I'm late sorry?
Thank you...Best Carb - ebay.us/EqIISy
Doesn't you're jets make a difference on where you live ? like higher altitudes smaller jets ,also does the needle for the throttle need to be moved for altitude too ? on my bike it runs weak at top end and sounds like its struggling for fuel I have the 80ccZed triple 40
Correct. The thinner air makes for a richer result. You need to put smaller jets in and raise the clip on the needle a notch I'd say
Are there any pumper carburetor intake manifolds for these bike kits? Id love to bolt on an HDA 43 tunable carb on it. I know they atomize fuel way better. And you can fine tune them way easier.
Not that I know of. Looks like a DIY thing
Hughes Motorized i took your advice. Heres my latest project. Let me know what you think? Its still a work in progress. ua-cam.com/video/wKVgXoGkscI/v-deo.html
Are there any good substitutes for the carb washer i lost mine and cant find the exact type online
I am not following you. Where on the carb are you talking about? Are you referring to the bowl gasket? Or?
It's in the throttle slide
@@xero_d4rkx650 I see now said the blind man. I've made one using tin snips to cut the circle out of 22ga steel and a hacksaw and small file to dress up the slot
OK I did everything the way you said and I'm still having a lean condition at full throttle...I look down at the carb and its blowing fuel out of it...and no I'm running no air filter...
needs a bigger jet if lean at full throttle
what size Jets do you run on your bike's carburetors
5mm Jet Kit - ebay.us/SzGxMn
i have a question how long will that motor last if it's taking care of
Hard to say. These are cheap, poorly built motors. You might get years, might get months
If you take good care of it and correctly mix the oil to gas ratio(not too rich nor lean)keep everything good and tight,replace the rings every couple years.......it can last many yrs and alot of miles
@@darkkonblackblade6161 Amen .Yet that's assuming the bottom end is somewhat decently balanced and the cylinder's chrome bore holds up. They are making the chrome bore thinner and thinner nowadays
What is standard size jet you suggest
For sea level? Stock engine? #66 jet
Thanks, I bought a racing carburetor and it sucked and was a waste of money as you said. I got the nt back and I'm gonna keep it
Could A NT carb work on phantom85?
Yeah, it's quite litterally the carb they use.
What’s a good mix ratio after the fourth tank I’m at my first tank and I got it at 18/1 is that good ? Thanks
4oz oil to a gallon of gas. From day one.
Here is my GREAT way of solving the air leak issue.... wrap the manifold with a few layers of yellow plumber's tape, get the carb snugly on, ditch the stock clamp altogether and use a hose clamp from the hardware store, and get it decently tight and you won't be having any leaks there for sure!
EDIT: The stock "hose" clamp is terrible. In my case, it didn't squeeze strong enough to keep the carb from flying OFF the manifold [this happening because when the piston goes down and closes the intake port, all the fuel and air coming through the manifold suddenly hits a wall, literally, and this causes tremendous back pressure, which blew my carb off].
Yeah dude. The crap "steel" screw they give you will start to buckle and eventually snap. I went with the same clamp but swapped the screw for a good steel Allen bolt. Works way better. But as to taping the tip there...I figured that was necessary. I'm shocked it's not in the instructions. I even went a step further putting oil resistant gasket sealer on the slot. It works great
@@gyromurphy Gasket sealer is a nice touch!!!
@@gyromurphy Speaking of replacing the crap screw with a quality Allen one, that's actually a good tip for EVERY SCREW ON THE WHOLE KIT WHEREVER POSSIBLE. I just wanted to throw that out there for whoever is reading :D
Just bought a used one throttle broken need knew one how much are they i saw metal one instead of plastic one how much
You can make one up or I can do it for you. Check this link out: bit.ly/2R0q0Mf
@@HughesMotorized how much? and would it be the aluminum one i don't know how to fixx the throttle cable. To make the Wright adjustment on it
quick question is my first time trying to start up my motorized bicycle I leave the choke open soon as it starts up I close the choke but the engine shuts off why is that?
These engines must be coaxed into running at first. I'll pull up on choke lever to start and if it's cold outside, I'll slowly push it down as engine warms up. I'll vary the throttle to keep engine going and take off to warm engine up.
what jet size should I run for higher top speed?
If at sea level a #66 works good. If you go fast, make sure you have a good front brake so you can be safe. Enjoy!
@@HughesMotorized my elevation is 423′ do you know a good jet for my elevation.
My bike (80cc/100cc Chinese) throttles really really high when the clutch is engaged. Otherwise it runs great. I've troubleshooted everything to the point I just bought a brand new carb and it does the exact same thing. I've covered every possible air leak with a cocoon of gasket sealer...still, throttles really high. Does anyone have any idea what on Earth the issue could be?
Thanks so much, this video explained every functioning part of the carb, nOw I get it. Thanks.
I'm trying to figure out what my problem is since I recently replaced my top end with one of the new 40mm intake jugs with the open teansfers- I absolutely cannot get it leaned out enough! I've got the smallest jet I think stock is .60mm? Which has always worked for my setup in summer- I've got the needle clio adjusted but I'm still showing and running rich enough to foul my plugs after about 30min of run time. Anyone have any ideas? It obviously has something to do with that new jug I just cant figure out what exactly it is.
I always port but I took it off and ported a bit more extreme, added TWO more bottom gaskets, then took 2mm off the deck to maintain squish but it only helped a bit.
I live at the 760 ft above sea level. I've got a stock 80cc 2 stroke with the NT carb. At the moment I'm still running 16:1 fuel mix with 1 more tank to go. What size jet should I run at this altitude and what groove on the pin? Thank You.
Id guess a #65 and 3rd notch to start. Play w/ it. Once you get it dialed in you good. Do a plug chop
@@HughesMotorized Thank You Sir. The carb came with a #65 and I've experimented with #60 and #70. I'll try the #65 again. I've added an after market CDI and NGK plug since the last time running the #65. I'll keep you posted
@@HughesMotorized I installed #65 jet and clip is on 3rd groove. The bike rides like a bandit. I haven't done the plug chop yet. This is the best it has run . Thanks again.
@@rickysmalling4507 Have fun & ride on !
my 80cc motorized bike was running great until it just bogged out on the way home from the gas station. I do not think it is an aelectical issue like the plug because i turned on the choke and it started but then shut off.
Very detailed video super helpful THANK YOU
Glad it was helpful!