I have an 80cc engine. Runs great. Won't accelerate. When clutch is pulled in, idle is way to high. What can be problem with accelerator not working properly
Question for ya I got a 100cc gas bicycle motor off of Amazon last year and I just found out tonight that my piston do not go all the way down past the exhaust hole you can see the top ring and it covers up half of the hole what should I do and how would I fix it or can it be fixed
Thanks for walking through this - I just completed this step - I'd seen 2 other videos - but yours broke it down - the bit about making sure the pistons rings line up properly was my hang up - thanks for talking about that.
I've 2 blown up ones and I'm trying to get them running again. I bought new piston and head gasket and cylinder and head and it's still hitting what's causing the problem? I never had changed the road can they stretch out
On my version my cylinder and head are All One piece and no studs so if I replace the cylinder and head do I have to also buy studs and having a hard time finding a a 1 piece design I only can find the 2 piece and can I do upgrade like from 80cc to 100cc
The flywheel and crankshaft require the rear wheel to move the chain continuously to start the engine, The weight of the flywheel adds inertia that I assume helps to accomplish some of that but the intention of the flywheel's weight is to balance the crank assembly at higher rpms
Hey my cylinder doesn’t want to slide down and I’ve been trying for 2 days and it won’t go down no matter how hard I press and the only thing I’ve done is replaced the top ring of my cylinder but everything else I’ve done as it should be done
I need help how do I find out the correct size piston. I have an anbull 100cc definitely a lie. Probably 80cc actually. I’ve heard it’s a bt100 motor. But I have no clue I’m brand new to this.
Next one i buy will be a BBR bikeberry. They work all tha bugs outa tha engine with upgrade bearings before they ship em. Cost alittle more but atleast u aint gota overhaul it right outa tha box.
Hello sir and thank you for all your videos I appreciate them very much they're very helpful I have a newer bike I've ran 2 tank of gas through it I ran it when the spark plug was loose for about 2 miles bought a new spark plug put new gas in it it's getting gas but it won't turn over can you help thank you
I find, when installing the head gasket as well as the jug, you can press 1 or 2 of the bolts, whichever way they need to bend to get them to drop without forcing them.
So his videos actually awesome for me because I've already broke three sets of rings trying to get pissing on with the head but definitely I think I know how to go about it now and I've built three of these motors already so I should know that but either way he definitely help me out thank you Hughes
I just wish this video had been filmed with better lighting to see more of what you did on everything. It is so very dark in places that it is difficult to see exactly what you did, but none-the-less, this is a great video, regardless. Thanks for sharing.
i just got a brand new Skyhawk .right out of the box o noticed some exhaust a small metal lip or flashing my gut says to port it i just dont want to take the hole jug off i have done everything else so it probably sounds silly .btw love ur videos
@@HughesMotorized i still love them though..its a hobby and a lot of fun once u get em right.ill bet a lot of people like myself.had that one perfect build.either stolen or lost in ways they could not control..i know i did.
i had a revaluation beach cruiser .66 Skyhawk .broke in so nice .never even had a chain come off..i kid u not 36 tooth sprocket after break in..that bike would do 50mph or more when it got to temp... NGK spark plug expansion chamber upgraded carburetor that's all I did I didn't do any porting but my next one I hope runs great I will update everyone on my page
First time builder (everything is still in the box). My question is when you put the wrist pin and assemble the bearing and the rod and place the piston on top are you supposed to use any oil/grease before connecting the piston to the rod???
How not to put a head gasket on. Putting it on that way can cause the head gasket to shave metal from the threads you should put the head gasket on flush before putting the head on
Wanted to say thank you for your time, as I've just completed my first build with the help of your expertise.Look forward to seeing more of your videos
@@thomasgannon711 . If you can see the clip and get a magnet to it is best but I'd never be that lucky. So...gas, acetone or any solvent will do. But yes. Take it outside and carefully add an ounce or two and swish it and dump it over until you find the clip. Avoid sparks, heat and flames for obvious reasons. Don't want you turning into a fireball. Make sure most of the gas gets out and try again. Good luck
hughes motorised, i have a problem on my 2 stroke 80cc. i replaced the piston rings,ever since the piston is hitting the head, both gaskets are on im pretty sure.
I don't think you used any sealant did you? Building a Mineralli with no base gaskets (Permatex Motoseal) and 1 copper head gasket for a 1.10mm squish, so dry head gasket is fine? I flattened them with glass and sticky back sandpaper the best I could\ oh yeah, Got my full suspension build going well, , improving parts all the time . Check out the "Focus on the chain video". i think you will like it, Bro
Hi. Thanks for the video. Just finished assembly of my first chinagirl 66/80cc. I'd like to ask for advice - i've screwed the plug in, added few drops of oil on the piston and i'm able to turn the engine with the socked wrench on the magneto screw... With my bare hand. Some resistance but i think it should be harder. The point is - is the compession so low in those motors or is there a risk that i did something wrong ? I've put new gaskets for the jug and head. Screwed it in with a torque wrench according with your tips. Checked all the surfaces (jug, head, block) - they're even and smooth. What do you think is happening there ?
@@HughesMotorized Hi. It doesn't run at all. It's a brand new spare motor. I've solved the problem. I wasn't listening carefully when you talked about garbage corn nuts :) It's ok now. Thanks.
I dont much about these engines but is it possible to turn the cylinder head 90° so the carb and exhaust are east n west instead of noryh and south . ?
At 17:30, I AM having that issue, where the piston is hitting the head. Very strange, and don't understand how that can be. Add another gasket or two below the head?
Thanks for all the tips, I just recieved my 66cc motor for my bike and yes it was disasembled, as I checked it out I found a cpl things odd. First off a broken ring, I ordered a set but they call it a 66cc set yet the engine says 69 cc, are the rings the same. Secondly there are two gaskets under the jug, should I just use one? thanks
there are many. gasbike, Bikeberry has the one piece head motors. You can also get on ebay. I'll offer you get a silver one and spray paint it yourself. the black powder coating is so thick it causes problems
Hey. So i just replaced my cylinder and cylinder head, everytime i try to start it, it squeakes like crazy. I tried without the spark plug, the squeaking was gone. Any advice?
I had a question I have a high compression head and I have a 66 cc engine the head is from a few years ago and I didn’t know if the heads were a one size fits all or if u need certain heads for different ccs I put it on the cylinder and the gasket doesn’t seem to smash between the cylinder and the head I didn’t know if it just meets with the cylinder on the circular edge or needs compressed the whole way between the head and cylinder?
ive just gotten into these 2 stroke motors for my bike, and i bought it second hand, so i first off rreplaced the metal head gasketbut have yet to get to the lower cylinder to crank case gasket. so i`ve been looking up on upgrades and tweaks i can do cheaply, ive got a banana exaust, and replaced the stock carb with another of the same(NT) but as i`m looking for another piston and cylinder i got wondering if an 80cc(66cc) cylinder or the 100cc would fit on the 50cc crank case?seems like the 80cc piston and cylinder are easier to find and cheap, it would be great if i could drop the larger cylinder on my 50cc crankcase...would that work?
Have you ever shown bearing replacement? I think that if you put in good, or better bearings, balance the crank and maybe a few other things they would last longer!
Hard to say. The chrome bores are getting poorer and poorer on these. I've heard of 10,000 miles max and 100 yards the least. I suggest getting a spare engine and some spare parts and have a spare ready and it'll allow you to learn and improve.
@@HughesMotorized It's gonna be a fun/part time use bike. I won't be relying on it to get to work or anything like that. If I have to push/pedal it back a couple of miles, no big deal. Years ago with a Honda Spree I had, one of the carb bolts fell out while I was out riding. I zip tied it back on as best I could on the side of the road, adjusted the carb to make up for the air being sucked in between the engine and carb, and rode it home that way.
can anyone answer this question? can i use 4 or 5 head gaskets to raise the cap if i dont have a high hole piston? ive got a long rod ,but a low hole piston. there ant tricks or treats some can educate me on?
@@kennethpeters3679 Get the correct piston. The bike will run poorly as the port timing will be off and that many gaskets will leak sooner rather than later is my 2 cents.
Awesome video, as always. I didn’t near you mention it, but do you recommend taking the cylinder studs out of the block and using lock-tight before replacing them to the proper depth? Thank you, sir!
I've always thought thread lock is fine for the studs. I seen Hughes using vise grips to grab them which is fine, I've done that myself but even with thread lock on the studs it's not that hard to back two nuts together on that stud to turn it out with a wrench. I'm actually surprised he didn't do it that way being as he had the motor mount nuts right there on the table which work perfect for turning them studs.
@@sebbyyt6226 well I installed it broken and it scratched the cylinder and piston. At this point I've replaced it and it worked fine until a few days ago and now its not hardly accelerating any ideas as to why?
Dear friend, i saw at ebay's pages, 2 stroke motorized bicycles kits for sale-brand new, something strange.The 80cc motors have 2,5 Kw power (5000 r/min) . and the 100cc motor has less (1.9KW), due to the description. Why is that?
A question I have had for a while and no one seems to touch base on the subject would be which kit to order and from who? I am probably going to start by buying a cheap kit and then upgrade parts from there. Doing so, I want to find a kit for a decent price knowing that a good bit of parts will be replaced! He you would respond which lit would you recomend preferably under $150!
I just buy the cheapest I can get off of eBay. ThatsDax sells some great kits. I figure they all are cheap enough and if you sort thru them you can keep one going. If you get a dud, break it down for spares
Anyone, I need help. I had to fight my head on. It's not in 2 pieces, it's just one solid head and body. Let's say I forgot to put the needle bearing on (excitement and also it was in a completely separate box). How the hell do I get the head back off?
If you have any desire to fall in love with the "China Doll" 2-Stroke again, then get yourself one of these StarFire SuperRat 70cc engines. From what I'm told, they address most of the main issues associated with the typical "China Doll" engines. Among several other improvements to the original "Happy Time", "China Doll" engines, these come with a High Quality, Die Cast Jug, with a Cast Iron Sleeve (I actually have one of these cylinders that I bought on eBay, and I can tell you without a doubt they are 10 times better than any stock/chrome jug I've ever seen), not to mention an upgraded Integral CDI Magneto. Now I haven't actually used one of these engines personally, at least not yet anyway, but it will be the next 2 stroke I buy. I was recommended this engine from an experienced builder who said that, "These will be the best quality "China Doll's" you can get for the price, mark my words." www.grubee.net/products/superrat-70cc-engine-coming-soon?variant=7094657744931
@@HughesMotorized From what my buddy tells me, they run better right out of the box than any other stock "China Doll" on the market, and will last significantly longer (granted you run & maintain them properly) without all the typical issues associated with these engines. Apparently Grubee listened to their customers feedback, as well as spent years researching the industry climate on social media. So by doing their due diligence, they became very aware of all the problems people were having with these engines, and subsequently the "SuperRat" is their answer to the problem. It will be their "Flagship Model" for years to come, and will only get better with time, as better components and aftermarket parts are starting to become more available due to the popularity and increasing interest in motorized bikes. The "SuperRat" will be (aside from the occasional defect) the best quality "Stock" 2 stroke "China Doll" you can get for the price. Right out of the box it will meet or exceed most people's needs/expectations. If you just need a reliable 2 stroke for getting around town, or just want to have a little fun, then it should work just fine for most people in stock form. That being said, however, with just a little upgrading/tinkering/modification, they can be very reliable, rock solid and surprisingly fast engines. If you add an MZ65 Pipe (or equivalent/better, don't be fooled by inferior imitations/clones, only the real deal MZMiami or quality custom made pipes will produce true "bolt on & go" performance, which will literally add an extra 1-HP or more depending upon the pipe & tune, but I digress), quality carburetor (doesn't have to be a "High Performance" carb, but a higher quality/better made carb, like a Dellorto, will allow you to tune the engine much more precisely, not to mention they are just all around better performing and longer lasting carbs, but again, I digress), and a CND High Compression Head (like a Fred or Jake Head, not really necessary unless you're doing the other upgrades I mentioned, however, if higher performance/speed is a goal, then these "upgrades" are a MUST!), a quality CNC high compression head can improve performance and especially cooling, more metal & surface area for heat to be dissipated, which is NEVER a bad thing for these engines.
Thanks, I just a motor on my old 1955 Schwinn Black Phantom. Of Course the fit was wide and I had to fabricate a front mount to make up the space. 14mm impact sockets were perfect. I appreciate your how to videos and common sense keeping in mind these are inexpensive, cheap China made motors. Nice tips improving and maintaining them.
sometimes the spark is very faint. Grab the plug and if you are screaming and cussing me, then you have spark. Failing that, the most often culprit is the magneto coil. 313 ohms with a multimeter between the black & blue. Also make sure the back side of coil is free f the clear varnish so there's a path to ground. Also make sure magnet is installed correctly. Remove spark plug and turn engine over till the pistion is at the very top. Called TDC. Make sure the key in the magneto is at the 1 o clock position. Sometimes they are put on backwardss
If any are in the crankcase, you'll need to flush it out well or even best, split case and clean out. Then inspect the piston & cylinder and make sure they are good. Then build and go
Dude check this out if you stick a clean towel in the bottom of the engine you should not have to worry about getting stuff in there and I like to use hot water on the fuel line I heat some water in the microwave and soak the line in it for a few and it slips right on
To be honest I've never used the 100s. Im sure they are OK. I just prefer having a removable head. Although lots of hybrids out there using 1 piece cylinders/heads running very well
I also found an easier and more efficient way to put the piston in. Because I broke three sets of rings doing it the way Hughes showed in this video, I didn't put the wrist pin in until I had the piston set in the head just a little past the bottom ring. Soooooo much simpler for me lol. It's just a suggestion just in case you have never set a piston into a cylinder before. I am in fact making a video today on it cause I'm putting new rings on.
yep,as usual your right. was a leaky gasket . head wasn't tight enough. now i have a bike that seems like as i was putting gf as in,it looked like water was mixed in w the gas. i drove it 3 blocks and it booged out. would it of just wuit like that over a few raindrops fell in gas can?
Your doing that wrong. You put the piston in the cylinder first with the wrist pin hole below the cylinder skirt, then lower the cylinder to line up crank with wrist pin hole,then insert wrist pin and clips. Much easier.
Pulling the piston out of the head is not a good idea IMO. You can connect the piston to the rod without having to pull the piston all the way out and unseating the rings. To Hell with fighting it later to get it back in.
I have an 80cc engine. Runs great. Won't accelerate. When clutch is pulled in, idle is way to high. What can be problem with accelerator not working properly
carb issue or intake air leak
It’s been awhile since I’ve disassembled and reassembled a little 80cc you’re an angel
Glad to help
Question for ya I got a 100cc gas bicycle motor off of Amazon last year and I just found out tonight that my piston do not go all the way down past the exhaust hole you can see the top ring and it covers up half of the hole what should I do and how would I fix it or can it be fixed
Thanks for walking through this - I just completed this step - I'd seen 2 other videos - but yours broke it down - the bit about making sure the pistons rings line up properly was my hang up - thanks for talking about that.
I've been trying to find out does the 100cc motorized bike engine have three rings on the piston
Can you reuse the copper head gasket? The parts for these are so cheap I don't know why you would bother but I've seen people do it
Inspect and if looks good, run it. The aluminum ones are good. Just use once is my way
I've 2 blown up ones and I'm trying to get them running again. I bought new piston and head gasket and cylinder and head and it's still hitting what's causing the problem? I never had changed the road can they stretch out
On my version my cylinder and head are All One piece and no studs so if I replace the cylinder and head do I have to also buy studs and having a hard time finding a a 1 piece design I only can find the 2 piece and can I do upgrade like from 80cc to 100cc
Is the flywheel in the engine sufficient for the piston to rise up to compress the mixture and complete the cycle?
The flywheel and crankshaft require the rear wheel to move the chain continuously to start the engine, The weight of the flywheel adds inertia that I assume helps to accomplish some of that but the intention of the flywheel's weight is to balance the crank assembly at higher rpms
Hey my cylinder doesn’t want to slide down and I’ve been trying for 2 days and it won’t go down no matter how hard I press and the only thing I’ve done is replaced the top ring of my cylinder but everything else I’ve done as it should be done
Shew, I thought my kit came without those g clips, I didn't think to look in the cylinder head fins, lol. Thanks
Would it be ok to put some WD-40 on the screws before sliding the motor on?
go for it
Hey do you know where we can get a exhaust extender for the manifold or make one
If the motor didn't come with the clips on the piston head can I still mount the top on it would it me it up
I need help how do I find out the correct size piston. I have an anbull 100cc definitely a lie. Probably 80cc actually. I’ve heard it’s a bt100 motor. But I have no clue I’m brand new to this.
Next one i buy will be a BBR bikeberry. They work all tha bugs outa tha engine with upgrade bearings before they ship em. Cost alittle more but atleast u aint gota overhaul it right outa tha box.
Good choice! I can give you a discount on one too. See my website HughesMotorized.com
Saw your videos back in 2015.. I have recommended your videos to several newbies. Houston Mo Sports
Thank you sir... More 2 come
How do I put the head and jug on when the piston is in the motor
Hello sir and thank you for all your videos I appreciate them very much they're very helpful I have a newer bike I've ran 2 tank of gas through it I ran it when the spark plug was loose for about 2 miles bought a new spark plug put new gas in it it's getting gas but it won't turn over can you help thank you
I find, when installing the head gasket as well as the jug, you can press 1 or 2 of the bolts, whichever way they need to bend to get them to drop without forcing them.
i have 6 washers and 4 lock nuts where do they go? on a 50cc
Can you make a one piece cylinder fit on the bottom end of a two piece cylinder?
So his videos actually awesome for me because I've already broke three sets of rings trying to get pissing on with the head but definitely I think I know how to go about it now and I've built three of these motors already so I should know that but either way he definitely help me out thank you Hughes
Does it matter what way the piston windows face
I just wish this video had been filmed with better lighting to see more of what you did on everything. It is so very dark in places that it is difficult to see exactly what you did, but none-the-less, this is a great video, regardless. Thanks for sharing.
i just got a brand new Skyhawk .right out of the box o noticed some exhaust a small metal lip or flashing my gut says to port it i just dont want to take the hole jug off i have done everything else so it probably sounds silly
.btw love ur videos
Yup, these are cheapo engines. Still fun. Thanks !
@@HughesMotorized i still love them though..its a hobby and a lot of fun once u get em right.ill bet a lot of people like myself.had that one perfect build.either stolen or lost in ways they could not control..i know i did.
i had a revaluation beach cruiser .66 Skyhawk .broke in so nice .never even had a chain come off..i kid u not 36 tooth sprocket after break in..that bike would do 50mph or more when it got to temp... NGK spark plug expansion chamber upgraded carburetor that's all I did I didn't do any porting but my next one I hope runs great I will update everyone on my page
They make a nice 1/4 inch torque wrench. Under $20 if your wanting to be safe. Great for all small engines. I happen to have a Sears.
I.always pull the head bolt studs and lock tight them and reinstall them properly.
First time builder (everything is still in the box). My question is when you put the wrist pin and assemble the bearing and the rod and place the piston on top are you supposed to use any oil/grease before connecting the piston to the rod???
How not to put a head gasket on. Putting it on that way can cause the head gasket to shave metal from the threads you should put the head gasket on flush before putting the head on
I put the gasket on first, then the head bolts, then the head..is this what you are saying?
Wanted to say thank you for your time, as I've just completed my first build with the help of your expertise.Look forward to seeing more of your videos
Glad to help
@@HughesMotorized I dropped piston clip into the engine will I have to take it apart or can I ride the bike with the clip at the bottom of engine
@@thomasgannon711 pour gas or acetone into engine and get it out. You don't want it in there.
@@HughesMotorized so will I take the engine off bike fill it with gas and then turn upside down
@@thomasgannon711 . If you can see the clip and get a magnet to it is best but I'd never be that lucky. So...gas, acetone or any solvent will do. But yes. Take it outside and carefully add an ounce or two and swish it and dump it over until you find the clip. Avoid sparks, heat and flames for obvious reasons. Don't want you turning into a fireball. Make sure most of the gas gets out and try again. Good luck
I bought a raw racer 100cc motor - it came with the head off the block - the head is a one piece flat top -
is this a cheap head ?
hughes motorised, i have a problem on my 2 stroke 80cc. i replaced the piston rings,ever since the piston is hitting the head, both gaskets are on im pretty sure.
Might need an additional base gasket
I don't think you used any sealant did you?
Building a Mineralli with no base gaskets (Permatex Motoseal) and 1 copper head gasket for a 1.10mm squish, so dry head gasket is fine? I flattened them with glass and sticky back sandpaper the best I could\
oh yeah, Got my full suspension build going well, , improving parts all the time .
Check out the "Focus on the chain video". i think you will like it, Bro
Hi. Thanks for the video. Just finished assembly of my first chinagirl 66/80cc. I'd like to ask for advice - i've screwed the plug in, added few drops of oil on the piston and i'm able to turn the engine with the socked wrench on the magneto screw... With my bare hand. Some resistance but i think it should be harder.
The point is - is the compession so low in those motors or is there a risk that i did something wrong ? I've put new gaskets for the jug and head. Screwed it in with a torque wrench according with your tips. Checked all the surfaces (jug, head, block) - they're even and smooth.
What do you think is happening there ?
does it run good? if so, you good
@@HughesMotorized Hi. It doesn't run at all. It's a brand new spare motor. I've solved the problem. I wasn't listening carefully when you talked about garbage corn nuts :) It's ok now. Thanks.
I dont much about these engines but is it possible to turn the cylinder head 90° so the carb and exhaust are east n west instead of noryh and south . ?
No. The transfer ports would be blocked and the transfer area on the case would cause the piston to lock up
Can you clean the cylinder piston without removing it
Must be careful or you'll risk getting junk into the crankcase
@@HughesMotorized ok thanks
At 17:30, I AM having that issue, where the piston is hitting the head. Very strange, and don't understand how that can be. Add another gasket or two below the head?
You can either add a base gasket underneath or a second head gasket... I'd say go w/ base gasket and see how it runs
@@HughesMotorized that's what I'm going to do... The bottom gasket. Just worries me that a complete kit would be like this. Seems so odd.
Thanks for all the tips, I just recieved my 66cc motor for my bike and yes it was disasembled, as I checked it out I found a cpl things odd. First off a broken ring, I ordered a set but they call it a 66cc set yet the engine says 69 cc, are the rings the same. Secondly there are two gaskets under the jug, should I just use one? thanks
Same on the gaskets. Pretty sure this thread is dead.
Can you perhaps tell me what company makes this black 2stroke motor i got its cylinder and head is one piece its black motor 66/£0cc
there are many. gasbike, Bikeberry has the one piece head motors. You can also get on ebay. I'll offer you get a silver one and spray paint it yourself. the black powder coating is so thick it causes problems
Hey. So i just replaced my cylinder and cylinder head, everytime i try to start it, it squeakes like crazy. I tried without the spark plug, the squeaking was gone. Any advice?
I bet the head gasket isn't sealing. The sound you hear is air escaping out the head gasket
@@HughesMotorized Yeah .. So i kinda found it out too, but thanks
I had a question I have a high compression head and I have a 66 cc engine the head is from a few years ago and I didn’t know if the heads were a one size fits all or if u need certain heads for different ccs I put it on the cylinder and the gasket doesn’t seem to smash between the cylinder and the head I didn’t know if it just meets with the cylinder on the circular edge or needs compressed the whole way between the head and cylinder?
Is it possible to change the 50cc cylinder set with an 80 without having issues in the lower part of the piston hitting the botom case?
No, the stud spacing is different.
ive just gotten into these 2 stroke motors for my bike, and i bought it second hand, so i first off rreplaced the metal head gasketbut have yet to get to the lower cylinder to crank case gasket. so i`ve been looking up on upgrades and tweaks i can do cheaply, ive got a banana exaust, and replaced the stock carb with another of the same(NT) but as i`m looking for another piston and cylinder i got wondering if an 80cc(66cc) cylinder or the 100cc would fit on the 50cc crank case?seems like the 80cc piston and cylinder are easier to find and cheap, it would be great if i could drop the larger cylinder on my 50cc crankcase...would that work?
We need building videos on the huasheng 4 stroke engine
Have you ever shown bearing replacement? I think that if you put in good, or better bearings, balance the crank and maybe a few other things they would last longer!
I haven't yet. Perhaps in the future. I have some big projects to finish up and if I get the time
Doing this live was an amazing idea. You don't get enough likes!
Why does my Piston have three rings instead of two like most?? Where can I get rings this size?
Never seen one. What engine is it?
It's a tune 80/100cc from BBR.. it's a single head and no porting is needed.. the ports aren't curved at all..
What is the typical life expectancy of one of these motors if assembled correctly and properly lubricated/maintained?
Hard to say. The chrome bores are getting poorer and poorer on these. I've heard of 10,000 miles max and 100 yards the least. I suggest getting a spare engine and some spare parts and have a spare ready and it'll allow you to learn and improve.
@@HughesMotorized It's gonna be a fun/part time use bike. I won't be relying on it to get to work or anything like that. If I have to push/pedal it back a couple of miles, no big deal. Years ago with a Honda Spree I had, one of the carb bolts fell out while I was out riding. I zip tied it back on as best I could on the side of the road, adjusted the carb to make up for the air being sucked in between the engine and carb, and rode it home that way.
hughes,heyyyy,i praise your vids.i just spent a week building a custom motorbike. i went for a test drive and found out i hsve zero compression
prolly a bad cylinder stud, installed incorrectly or leaky gasket
can anyone answer this question? can i use 4 or 5 head gaskets to raise the cap if i dont have a high hole piston? ive got a long rod ,but a low hole piston. there ant tricks or treats some can educate me on?
@@kennethpeters3679 Get the correct piston. The bike will run poorly as the port timing will be off and that many gaskets will leak sooner rather than later is my 2 cents.
Hello, will the 80cc cylinder fit my 50cc motor if the stud placing is the same?
Stud spacing is different and cylinder won't fit either
Should you coat the new jug with oil
Awesome video, as always. I didn’t near you mention it, but do you recommend taking the cylinder studs out of the block and using lock-tight before replacing them to the proper depth? Thank you, sir!
I forgot that. I have seen some where people ran the stud thru the case and hit the crank assembly
I've always thought thread lock is fine for the studs. I seen Hughes using vise grips to grab them which is fine, I've done that myself but even with thread lock on the studs it's not that hard to back two nuts together on that stud to turn it out with a wrench. I'm actually surprised he didn't do it that way being as he had the motor mount nuts right there on the table which work perfect for turning them studs.
Mine came like this and I installed it backwards and broke the rings while installing where can i buy new piston and rings
You broke the piston and the rings??
@@sebbyyt6226 well I installed it broken and it scratched the cylinder and piston. At this point I've replaced it and it worked fine until a few days ago and now its not hardly accelerating any ideas as to why?
Dear friend, i saw at ebay's pages, 2 stroke motorized bicycles kits for sale-brand new, something strange.The 80cc motors have 2,5 Kw power (5000 r/min) . and the 100cc motor has less (1.9KW), due to the description. Why is that?
Hey. I dropped my retainer clip into my motor. What should I do?
Spray brake or carb cleaner into engine and slosh it around and pour out. Repeat until you get the clip
@@HughesMotorized thank you man. I was shaking my motor and it came out.
I need new studs for my head what size are the studs for a 66cc engine
Usually 8mm or 6mm
I'm currently working on a reverse one-piece head and putting the air intake/carburator up front and the exhaust facing the rear...any advice?
Good luck! I've read you need to match the transfer ports or it will run poorly
A question I have had for a while and no one seems to touch base on the subject would be which kit to order and from who? I am probably going to start by buying a cheap kit and then upgrade parts from there. Doing so, I want to find a kit for a decent price knowing that a good bit of parts will be replaced! He you would respond which lit would you recomend preferably under $150!
I just buy the cheapest I can get off of eBay. ThatsDax sells some great kits. I figure they all are cheap enough and if you sort thru them you can keep one going. If you get a dud, break it down for spares
@@HughesMotorized Thanks for replying back bud, I will look into them!
Is there a way to get all the shavings out of the bottom end without taking it all apart?
Highly recommended you disassemble and clean as crud can get into bearings
Anyone, I need help. I had to fight my head on. It's not in 2 pieces, it's just one solid head and body. Let's say I forgot to put the needle bearing on (excitement and also it was in a completely separate box). How the hell do I get the head back off?
When I got mine there was no piston clips already installed what do I do
order some of them and install?
What about STEEL pistons?
Thanks a ton man! I had many of the issues you said to avoid and then saw your video and was able to fix my problems.
Glad I could help!
piston won"t turn after spark plug inserted. does that indicate a thrown rod?
might be plug too long or most likely need another base gasket under jug. New engine?
When I release the clutch, the back rim and tire locks up. I think the crank shaft is stuck.
If crankshaft was stuck the engine wouldn't run. You have an issue in your wheel / hub
If you have any desire to fall in love with the "China Doll" 2-Stroke again, then get yourself one of these StarFire SuperRat 70cc engines. From what I'm told, they address most of the main issues associated with the typical "China Doll" engines. Among several other improvements to the original "Happy Time", "China Doll" engines, these come with a High Quality, Die Cast Jug, with a Cast Iron Sleeve (I actually have one of these cylinders that I bought on eBay, and I can tell you without a doubt they are 10 times better than any stock/chrome jug I've ever seen), not to mention an upgraded Integral CDI Magneto. Now I haven't actually used one of these engines personally, at least not yet anyway, but it will be the next 2 stroke I buy. I was recommended this engine from an experienced builder who said that, "These will be the best quality "China Doll's" you can get for the price, mark my words." www.grubee.net/products/superrat-70cc-engine-coming-soon?variant=7094657744931
GruBee Rocks. Looks like a solid engine!
@@HughesMotorized From what my buddy tells me, they run better right out of the box than any other stock "China Doll" on the market, and will last significantly longer (granted you run & maintain them properly) without all the typical issues associated with these engines. Apparently Grubee listened to their customers feedback, as well as spent years researching the industry climate on social media. So by doing their due diligence, they became very aware of all the problems people were having with these engines, and subsequently the "SuperRat" is their answer to the problem. It will be their "Flagship Model" for years to come, and will only get better with time, as better components and aftermarket parts are starting to become more available due to the popularity and increasing interest in motorized bikes. The "SuperRat" will be (aside from the occasional defect) the best quality "Stock" 2 stroke "China Doll" you can get for the price. Right out of the box it will meet or exceed most people's needs/expectations. If you just need a reliable 2 stroke for getting around town, or just want to have a little fun, then it should work just fine for most people in stock form. That being said, however, with just a little upgrading/tinkering/modification, they can be very reliable, rock solid and surprisingly fast engines. If you add an MZ65 Pipe (or equivalent/better, don't be fooled by inferior imitations/clones, only the real deal MZMiami or quality custom made pipes will produce true "bolt on & go" performance, which will literally add an extra 1-HP or more depending upon the pipe & tune, but I digress), quality carburetor (doesn't have to be a "High Performance" carb, but a higher quality/better made carb, like a Dellorto, will allow you to tune the engine much more precisely, not to mention they are just all around better performing and longer lasting carbs, but again, I digress), and a CND High Compression Head (like a Fred or Jake Head, not really necessary unless you're doing the other upgrades I mentioned, however, if higher performance/speed is a goal, then these "upgrades" are a MUST!), a quality CNC high compression head can improve performance and especially cooling, more metal & surface area for heat to be dissipated, which is NEVER a bad thing for these engines.
I just got a brand new cylinder, should i hone it?
They are lined with a plating so no
One of my piston ring its bigger than the other is the big one supposed to go on the top or bottom?
Should be exact same size
Can you put 2 head gaskets on
yes
I never even thought about the steel studs and aluminum expansion. I should have. Great info
Thanks, I just a motor on my old 1955 Schwinn Black Phantom. Of Course the fit was wide and I had to fabricate a front mount to make up the space. 14mm impact sockets were perfect. I appreciate your how to videos and common sense keeping in mind these are inexpensive, cheap China made motors. Nice tips improving and maintaining them.
I can not get a spark brand new motor to tell me ???
tried every component please help
sometimes the spark is very faint. Grab the plug and if you are screaming and cussing me, then you have spark. Failing that, the most often culprit is the magneto coil. 313 ohms with a multimeter between the black & blue. Also make sure the back side of coil is free f the clear varnish so there's a path to ground. Also make sure magnet is installed correctly. Remove spark plug and turn engine over till the pistion is at the very top. Called TDC. Make sure the key in the magneto is at the 1 o clock position. Sometimes they are put on backwardss
I need help to put my head on why the piston is in the block
Could a blow by be fixed?
new rings. I really suggest a new top end. rings, piston , cylinder, wrist pin
Can I use the old piston rings when I change the piston n cilinder for a new 1?
I'd advise you don't. Get new ones is my 2 cents
I actually put the old 1s on n it's riding mighty fast, turns on great. Been at it all day.new carburator as well.
Can u share a link to the 97cc 4 stroke motor
amzn.to/2Z3uFSK
Please I need help for my own bicycle motor 50cc in install my own but is not moving why please
Clutch might be stuck or rear wheel not setup correctly
I broke both of my rings what do I do?
If any are in the crankcase, you'll need to flush it out well or even best, split case and clean out. Then inspect the piston & cylinder and make sure they are good. Then build and go
@@HughesMotorized thanks I had to order new rings and a head gasket the one that I got was completely bent
Try a g5 iron bore cylinder. EBay $25
Needs a little porting and decking.
Dude check this out if you stick a clean towel in the bottom of the engine you should not have to worry about getting stuff in there and I like to use hot water on the fuel line I heat some water in the microwave and soak the line in it for a few and it slips right on
You have to spend the piston rings into the spot they supposed to be in one at a time like he's doing
DO you rate the "100cc" chinas over the "80cc" dolls?
To be honest I've never used the 100s. Im sure they are OK. I just prefer having a removable head. Although lots of hybrids out there using 1 piece cylinders/heads running very well
My 80cc engine is making A clanking sound around riding threw 5 tanks
Getting louder or quieter? Is this your first Motorized bike?
@@HughesMotorized it gets loud as hell
@@HughesMotorized I took clutch off an it has alot of play In it
@@richardfischer4685 Post some pics and a vid showing what you are finding on my Facebook group Hughes Motorized. We'll see if we can sort it out
Where do u buy your motors at
Ebay, Gasbike or Bikeberry. It's tougher nowadays as inventories are low
Great video 👍
thanks man, great video just what I was looking for!!
Glad I could help!
I really enjoy your vidios my friend!!! Good stuff!!!
Locktite will strip threads when heated and it expands
I also found an easier and more efficient way to put the piston in. Because I broke three sets of rings doing it the way Hughes showed in this video, I didn't put the wrist pin in until I had the piston set in the head just a little past the bottom ring. Soooooo much simpler for me lol. It's just a suggestion just in case you have never set a piston into a cylinder before. I am in fact making a video today on it cause I'm putting new rings on.
nice idea
Put a small rag in the hole so nothing falls in the motor if you're worried about it
why doesnt my back tire want to move hmmm clutch......
Probably
wat can i do
yep,as usual your right. was a leaky gasket . head wasn't tight enough. now i have a bike that seems like as i was putting gf as in,it looked like water was mixed in w the gas. i drove it 3 blocks and it booged out. would it of just wuit like that over a few raindrops fell in gas can?
YOU ARE ONE OF THE BEST.....GOOD THANKS...
thank you for this sir!
My pleasure!
lol one of my circlips flought all the way accros my room ; i spend 1 hour searching it
Good video but Iam never able to watch them live. I have to always revert to your videos Hours or a day or so later..
What device are you using to watch? Wi-fi or 4G connection?
Your doing that wrong. You put the piston in the cylinder first with the wrist pin hole below the cylinder skirt, then lower the cylinder to line up crank with wrist pin hole,then insert wrist pin and clips. Much easier.
Pulling the piston out of the head is not a good idea IMO. You can connect the piston to the rod without having to pull the piston all the way out and unseating the rings. To Hell with fighting it later to get it back in.
Yea, verily!!
Bom 👍