GY6 Carburetor Fuel and Vacuum lines (simplified) 1 of 2

[@ToddTesla]

THANK YOU, simply for showing and bringing me through properly losing the air box for performance. I just moved to a small city in Colorado, and I’ve been fixing scooters , doing bore kits, but I haven’t found a proper showing of exactly how this is done.. you just helped me make more money in these crazy times!

[@joshuapityer9232]

Well I look

[@FmStudio2013MixMaster]

Hey Todd, You Need To Watch His Follow Up Video On This.. He Has Incorrect Ventalation And He Disconnects His One Way Fuel Valve. I Also Live In Colorado And I Need A Scooter Mechanic As There Are NONE Here. I Have A Kymco 250. 2004. Please Hit Me Back If You Are Still In Colorado Please. Denver Area.

[@FmStudio2013MixMaster]

Also, Read RedNeckGaming's Comment.

[@ttown692002]

Dude you literally made this a lot harder than needed.

[@damianosplay9457]

nah, he went above and beyond

[@saimonemafi434]

Instantly subscribed when u said people dont be showing you nun you gota be seeing

[@charredskeleton]

Very nice clean work. All matching clamps on everything. Again nice work!

[@GeorgeRoberts]

Thanks for spending your time showing the details.

[@RedneckRepairs]

the PCV valve is used to scavenge oil fumes, and blow-by gasses from engine combustion into the intake to be burned, as an emissions consideration...however it has a secondary, and far more practical use, which is to create negative pressure in the crankcase, because this helps prevent oil seal leaks, and oil consumption. Routing it to the gas tank will not at all help, and sadly, will likely somewhat contaminate the fuel, as when the engine is cold, condensation is a major consideration until the engine achieves operating temperature. I don't believe i'd route it to the gas tank. I would instead "T" it into the main vacuum port (after the PCV valve --which is the black plastic item in-line between the valve cover vent and the gas tank in your video). Since the connection on the gas tank is also meant to route fuel fumes to the intake, a "T" there would possibly be appropriate, although, it's better to just use a short piece of vacuum line and a fuel filter (to allow it to breathe without allowing debris in) because the fuel tank can't be counted on to be airtight, and thus vacuum tight..which would create a vacuum leak. In summary: I would route the pcv to the intake, and route the gas tank vent to a short piece of line with a fuel filter on the end, for maximum benefit.

[@JQUICK21]

Thanks! Any good videos or info you can share about all these lines, filters and so forth? Confusing as hell for me since I am not a mechanic. Just got a new carb, hoses, filters and manifold. The manifold I bought is like the OEM manifold and does not have a way to put a hose into it.

[@ballsackmanfred]

Someone that actually understands

[@natvega1]

If you add just a fuel filter like this person says,,,, when you fill your tank to the bottom of the filler neck gas will leak out and continue to leak out until you lose enough gas that when your bike is on the side stand it won't leak anymore,,,,,,, the tank vent solinoid goes where it supposed to go, to the canister or you will suck in oil and condensation to your gas and your spark plug will let you know about it as it becomes fouled.😮

[@anthonymyers-35]

Nice job mike! I always enjoy your videos

[@hunterchung7070]

My SYM carburetor scooter over half year that engine does not working in Taiwan!
Due to my fuel tank located within under SYM scooter pedal, and I try to push scooter start motor switch and then I got some situations as below: (1) engine cylinder pressure is 126psi (2) spark plug has flash (3) fuel tank is not pushing gasoline through the fuel filter out? It seems my scooter fuel line system has block issue, could you offer some suggestions to help me fix my breakdown scooter here, thanks!

[@armandopatane5343]

This is exactly what I need to see perfect video

[@wallytruman9433]

I appreciate your time and help

[@1017squirrel]

Very detailed!!

[@anthonyleyva9674]

Am I the only who laughed when he said “ for offf road use only cuz we live in California 🤣 lmfaooooo I feel you man i live in San Diego

[@johngibbles477]

Got a new nibbi carburetor was so confused on the hoses thank you so much!

[@JQUICK21]

Did you have to do all kinds of work and messing with the carb, it's jets and that frustrating shit? I'm not a mechanic and don't want to always be messing with carbs and their parts.....seems some guys get new carbs, get the scooter running and then something goes wrong away from home and it can be carb adjustments, jets and whatever else. And this is with brand new carbs if you go and see the comments at Amazon.

[@TheVegasbud]

That fuel line looks a little short i would make it a bit longer so your suspension can travel and not rip it off . That black and red thing is a petcock and that hose connects to bottom of the the tank or . That hose off the manifold should be plugged off because that NCY carb has no Air cutoff valve and that is a vent on the side of the carb that should be left open , The case ventilation hose should be left open in that case and mounted high so you get some drain back ,that one way valve will work but it is so cheap i would not trust it . And running that crank case vent line back to your carb is sort of useless with a open element air cleaner it can be done but why ! Nice manifold and carb set up

[@steverandall5814]

You've got the shut-off valve several inches away from the gas tank outlet with only fuel hose between the valve and the tank. If the hose splits, falls off, or worse yet burns through, the entire fuel tank will empty unrestricted through the open tank outlet. This could cause an instant fire literally under your ass. The previous commenter is also right...that fuel line is way too short. Zip tie it to the frame and cross over to the carburetor at a right angle. You don't want the fuel hose to be flexing with every movement of the rear suspension.

[@JQUICK21]

@@steverandall5814 Steve, any chance you can share your methods and how you would go the lines, filters and so forth for vacuum and fuel? Or is there a good video here you could share? Thank You for any response or suggestions!

[@steverandall5814]

@@JQUICK21 Leave the OEM vacuum operated petcock and gas hoses as they came from the factory! Sometimes when the carburetor bowl is empty, the starter can't spin the engine fast enough to generate enough vacuum to open the petcock. Gas never flows from the tank to the carburetor and the scooter won't start. The solution is really simple. If you apply vacuum from a pump (best) or from your mouth (if you don't have a pump) to the vacuum hose that leads from the carburetor to the petcock, you're doing what the engine would do if could spin fast enough. If you apply any vacuum source to the petcock, it will open and gas will flow and fill the carburetor bowl. The scooter should now start normally.

[@JQUICK21]

@@steverandall5814 Thank You Steve very much! However I just bought a petcock replacement that has an on/off switch and nothing on it for any vacuum lines. I am going straight from the tank, to the filter and to the carb. i saw this in another video. So I just need to know which vacuum lines can be done away with and which I need to have hooked up. I"m sorry for some many questions here.....

[@steverandall5814]

@@JQUICK21 I strongly advise NOT to use a pet cock that requires a hose between the tank and the petcock. If the hose between the tank and petcock fails, the entire contents of the tank will drain out. If your scooter is parked in the garage, the gasoline fumes could be ignited by the hot water heater or furnace.

[@fatboiwtf2948]

Can i just let the positive crank case ventilation just vent ?? Or do i have to attatch it to the gastank?

[@stonedtaylor]

Thanks for simplifying the system you guys are great! Post more vids like this please! :)

[@RP-dv3pw]

Awesome video

[@NCYSTORE]

Glad you enjoyed it

[@natvega1]

Where did you buy that one passage way ventilation crank as you call it?😮 it is a ventilation solinoid.... where did you buy it???😮

[@gordonbrown6635]

Just wondering how wet your K & N gets when you ride in the rain? Probably not good in wetter climates since the filter is right in front of the back tire and probably gets hosed pretty good.

[@NCYSTORE]

True my best to use a polyurethane like a uni filter

[@s.f.morris7331]

question: if I removed the fuel petcock and used a fuel manual shut on/off valve should I plug both manifold stems since I dont need a vacuum pump anymore

[@kyle460]

I bought a new carb and my original carb had a manual choke and my new one has an electronic choke but I have no where to plug it in is it necessary or can I leave it hanging?

[@FmStudio2013MixMaster]

It Needs Power. Connect it To Fuse Block.

[@toothlessboss]

I have a Baja 150 exact same engine any tips to get it started it’s turns over but doesn’t start

[@blessedbackpacker222]

does that Plastic shut of valve holds for like year of regular usage?

[@ZAzamar123]

Where can I buy one of those filters and shut off valves?

[@zacheryhoward7409]

How long can I run it with crank case vent disconnected? I need to see if I can get my started

[@michele-annshaw3682]

Thanks this is very helpful

[@rexcrockett9160]

This video helped me alot wish other ppl showed more and explained as well

[@seanmayo206]

That's a ncy carb? Looks like my oem carb on my 50

[@bobbiegoble3686]

Can can you show me how to hook up the fuel lines when there's two lines coming from the gas tank

[@youtuup]

GREAT Video, this I like !!! But now a serious question because I realy don't know much about scooters... I have a 50cc Rover Retro Scooter with (as far I found out) also a GY6 carberator. (4 stroke) and it LOOKS exactly the same like yours.. But with another huge black plastic filter..Question: Can this way of "wiring" also be done on my carberator/scooter?

[@roybray8741]

Do I put a hose on like u did for air intake

[@NCYSTORE]

yes, you can don't forget the one-way pass ventilation filter ncystore.com/g-one-way-check-valve-fit-3-16-in-milan-premier-znen-150

[@fernandobruno90]

What happens it I leave the crank line disconnected? I deleted the air box and my fuel tank doesn't have another inlet only one outlet

[@traviswyan1231]

What if your gas tank is lower than your carb but still getting fuel?.. Sounds like it wants to start but has a put. Tried adjusting the idle

[@julianarodriguez3635]

Will they fit on a Honda beat 125cc in the Philippines let me know thanks

[@TheBiscuitFactory]

Is that a gy6 B ? And are the carbs on gy6 supposed to be rear facing like this?

[@servantoftheservant5022]

Newsubscriber lets c what u got best south africa

[@07chilj]

Your vacuum line coming out of the crankcase looks like it's being pinched by that zip tie. It might not be fully closed, but you may want to cut that zip tie & fit it a little more loose with a new zip tie.

[@joshlavador4706]

what size k&n filter fits on the 30mm NCY carb?

[@NCYSTORE]

here the spec currently out of stock ncystore.com/k-and-n-air-filter-cone-48mm-30-degree-angle-rc-1290 but I'm sure you can find it on Amazon here amzn.to/3gNkwmq

[@FKtdyvan]

Can those of us who don't see the importance of the positive crankcase ventilation also remove that system because these systems are unnecessary sources of problems and leaks on scooters? Then, the fuel line from the tank can be connected directly to the carburetor with a manual switch?

[@enfuzzygamer4987]

Yes and yes

[@dylanjosselin]

you can just throw a little paper filter on it.

[@eclipz3424]

No because the problem is, the valve cover pressure release line tends to run to the air box, which when running is sucking that pressure out every 4 rotations, causing a negative airspace within the cam valve cover, which then helps the other functions of the piston system as it surges through high and low pressures constantly. The issue with upgrading to a new air filter is that it doesn't accommodate for these lines and so you have to find a new way to make the pressure flow properly. Truth is, there is no right way to do this, as long as it runs and air flows properly. However the feel like will not run fuel through unless there is a negative pressure running through the vaccine line that activates throughout the intake cycle of the piston. It's hard to explain but basically that line is to help with negative pressure. My best bet would be to run that to it's own one way valve, and run it into exhaust to help with suction, or run it straight out into air. The one way valve should help with holding the negative pressure

[@robertbell1804]

I got one of those red and white on and off switches for the gas line on my moped didn't have it every long and its plugged up these things are junk and unless

[@johnhagerman3747]

Nice

[@genevieverancourt4683]

ok thanks good video

[@Cryptixpx]

I don’t understand. Running the Crankcase vent to the gas tank? Won’t that put oil in my gas. What’s the work around?

[@RellyOhBoy]

Don't run the crankcase vent hose into your gas tank. That's just plain stupid. You'll end up with oil in your gas and a fouled carburetor eventually. Smh.

[@NCYSTORE]

It captures a bit of a gas vapors and some oil residue recycles it back to engine filter through the air filter/ carburetor.

[@Cryptixpx]

@@NCYSTORE but you had a one way fuel valve that lead to your tank. The pressure comes from your valve case and goes into your tank along with the oil. You need something to catch the oil

[@JonahNAloha]

3:30, you should have used a short piece of hose on the opposite end then hookup the bigger hose.

[@johnnytsunami4810]

My peacock is screwed into the fuel tank is there an adapter that screws in place of the petcock to a fuel line hose bib

[@_li1.loc3_8]

did you ever fiqure it out

[@curtissnance3812]

6AN female to 3/8 barb.

[@_li1.loc3_8]

how did you hook the hose straight to the gas tank isnt there a petcock or valve under the gas tank did you remove it ? or how did you hook it up

[@Smodlee]

The video shows what he did 😂 he hooked up the fuel line directly from the tank to the carburetor

[@nb2481]

Don't buy the blue fuel line from Amazon it's cheap and degraded in one season. Residual gas from sitting probably was the culprit. I recommend using the black fuel line.

[@mchstar]

Does anyone know if I could put a Honda cable operated carb on my scooter I wanna eliminate vacuum lines just go old school like a carb off the 110 atcs something like that would it work

[@roybray8741]

I have a gy6 49cc I'm putting a manual shut off valve on it been siting for 3 yrs not starting someone put caps on air intake part need help

[@NCYSTORE]

sorry late response any more ideas

[@IFixShet]

Clearly with street tires you don't use this for off-road use nice usage of the word and the language however not sure if you're scapegoating anything by saying that

[@NCYSTORE]

Very true LOL

[@pujo28]

Question: I have a 50cc TaoTao. I upgraded fuel line, filter, carb n added shutoff. I reduced my fuel line from 1/4 down to 3/16 after the fuel filter since where it connects to carb the 1/4 line was way too loose. I had it running after all upgrades were done but now it Doesn’t wanna turn over. Seems like it’s starved for fuel. I see u put silicone over the connection where the hose was too big. Could reducing fuel line size after the filter be my problem? Did U use regular silicone? Thx

[@noquemacuh8447]

n
o

[@ricardopestana4525]

Hi, why did you eliminate the petcock? Is there an advantage in doing so?

[@mrgoldendeel]

Because they are cheap...always leak and are easily broken.

[@edgarslacis7842]

What if i don't have a vent on my gas tank?

[@vidman05]

Instead of overflow tube it Might have a small hole on the neck between cap and tank. If you ever overfilled you know it. You would think you'd sprung a leak. Don't overfill!

[@jamest.5001]

If it doesn't have a vent the fuel will not come out it will eventually vacuum lock, it must have some type of vent, in a system like this I'd use a large tee with reducers to fit the lines, connect the fuel tank vent and crank case vent to the tee, then drill a hole in the end of the air cleaner, with Barb fitting then run a line from the airfilter, to a fuel filter as then to the tee with the other lines connected, it should work fine!

[@srwickpro]

Looks like the same chasis of yamaha grand axis 100

[@peterdagalea7207]

Is the gy6 the Lance scooter engine?

[@NCYSTORE]

Lance uses a gy6 engine.

[@dylanjosselin]

From my crank case, i added a small paper filter. no tube back to my gas tank. you think that will be ok? I haven't noticed any leaking.

[@NCYSTORE]

How's the working so far two weeks now since I replied

[@dylanjosselin]

@@NCYSTORE the paper filter works well, no leaks, and no other issues. Ill be putting on a BBK I ordered from your store. Hopefully that wont impact anything. I also got a crankcase breather hose, Im not sure where I got that from. I had to order from a couple different spots. Im doing the 171BBK with an A9 cam, and 16*37 final gear.

[@roybray8741]

Can't I put caps on end of carb where u put hose at for air

[@NCYSTORE]

It's a vacuum line put it to good use, but yes you can.

[@roybray8741]

@@NCYSTORE ok or do u think put petcock back on new one with new hoses I was gona buy new carb to it's been sitting for 3 yrs only 17 bucks

[@elveneye]

Where did you get your 'one passage way ventilation' that you mentioned??
It is not in the description.

[@NCYSTORE]

super late response but here ncystore.com/g-one-way-check-valve-fit-3-16-in-milan-premier-znen-150

[@FKtdyvan]

Besides the vacuum and fuel lines that you explained, there are two
other thicker black hoses on my Evo 150cc Taotao scooter. They start off at the
right-hand side of the scooter. One of those hoses goes to the front of the
scooter's where it is connected to the engine. The other thicker black hose is
connected to what looks like a black canister at the right-hand side of the
scooter's frame. It is located on the frame between the fuel tank and the
ignition high-performance coil box. However, at its end, this thicker black
hose (about double the size of the other vacuum lines) is not connected to
anything on my scooter and is just hanging by itself. I am suspecting that it
is the reason why the scooter is not starting. Also, on the left-hand side of
the scooter's frame, there is what looks like another black canister which has
two hose connections, one small another one bigger, but then there are no hoses
connected to it. I suspect that the lose thicker black hose that is dangling in
the middle of the scooter fell off from that. May that be the case? However, I
don't want to connect that hose to the black canister on the left side of the
scooter because I am not sure that it is supposed to be connected there. So
far, I have searched in vain and have not found a UA-cam video with an
explanation of the purpose for those thicker black hoses on the scooter. Are
they part of the scooter 's vacuum system? Please advise. I look forward to
hearing from you. Your explanation will be highly appreciated.

[@redsolocup918]

Dude mines got that too

[@nb2481]

Is the manifold vacuum completely plugged off?

[@curtissnance3812]

Exactly what I'm trying to figure out. Why is there a hose instead of a cap on the manifold

[@nb2481]

@@curtissnance3812 I ended up putting a screw in it. I sealed it with some gorilla glue. Just a little bit towards the head of the screw. And let it dry, for a day or two. So nothing gets sucked in. It worked with no negative effects.

[@nb2481]

I actually had a small hose connected to it. Maybe an inch long. Maybe not even that. Just so it didn't look too goofy. My motor was pretty visible. I put glue around the nipple before attaching the piece of hose to it. Don't want loose air flow getting in. I'm sure that would effect performance.

[@DarkHorseModz]

What adapter did you use to get rid of the vaccum petcock? My petcock is on bottom of my tank and I'd prefer a manual one like you folks show.

[@NCYSTORE]

just installed briggs switch found on amazom somewhere forgot the link.

[@_li1.loc3_8]

@@NCYSTORE did you install the switch at the bottom of the tank and then another switch as the shut off?

[@_li1.loc3_8]

same here theres a petcock at the base of the tank did you ever fiqure it out is there a way to connect the hose straight to the gas tank or did you buy a valve

[@RellyOhBoy]

Venting the crankcase into fuel tank (especially without an oil separator) ?? Ummm, Nope. Sorry, I don't like oil in my gas tank.

[@Cryptixpx]

Thank you. That’s what I’m tryna figure out 😂 have any ideas? I wanna use a cone filter and do t want to have to run 2 lines into it.

[@RellyOhBoy]

@@Cryptixpx I run a catch can and a 2 stage uni pod foam filter. My hose goes crank case vent >catch can> uni pod filter. I just stick the hose from the catch can in between the foam layers of the Uni pod filter. The catch can condenses most of the oil but some will still end up back in the airfilter and the intake.

[@Cryptixpx]

@@RellyOhBoy Okay can you tell me what kind of catch can you use. And what about the emissions from the gas tank do you just ignore or cap that?

[@RellyOhBoy]

@@Cryptixpx gas tank vent I just run a short length of tubing to a small fuel one way filter tucked inbetween the tank and the rear fender.
The catch can I got from Amazon www.amazon.com/dp/B07K9LMF3X?ref=ppx_pop_mob_ap_share

[@Cryptixpx]

@@RellyOhBoy Got it, thanks a lot. Hope this guys scooter didn’t shit itself.

[@yoski203]

The ccv vents exhaust!! Godd$^&^! Youre putting exhaust gas thick with carbon, back into your fuel. Carbon robs the oil of lubricity.... so get it outta there!

[@samuelhenry6187]

The tube he's pointing to at 1:52 is split open on my bike. My bike is not starting. Is this directly related? I don't quite understand the function of this tube.

[@michelindelossantos5749]

mm

[@roybray8741]

Hey bro do u have fb I need help with my gy6 49cc not starting my name is Roy bray in red shirt on fb

[@thirdworldTrini]

🤝🙏

[@ResachDsreabn]

O

[@dennistominski2533]

Jesus H! ! Way too fast for an instructional video. SLOW DOWN! Are you one Speed?!

[@bobbiegoble3686]

Can you show me how to hook up the lines when there's two lines coming from the gas tank

[@_li1.loc3_8]

did you ever fiqure it out?