Scooter CVT Transmission : Full Service Inspection 

Great video. No BS. Just incredibly useful and detailed images and explain. Thanks.

I usually put grease in the grooves where the pins ride and a thin coat on the torque driver in the area between the seals.

great step by step video very well and clear explanation i dont understand why someone would give this video a thumbs down some people are just to stupid not appreciate a good honest instruction sorry for the french

Thanks so much for posting this video! I have a 2007 Baja SC50 with the QJ1P39QMB-3 motor mated with the 1E40QMB Jog/Minarelli CVT that uses 2 stroke CVT parts that look like the ones in this video. The clutch and variator look just like the ones in this video but the CVT cover is different and unique on the Baja. It is a big help to see a CVT that actually looks like mine being shown! It took me awhile to understand why videos showing typical Chinese scooter CVT's were using parts that didn't apply to my scooter. It was even more confusing as Baja also made another version of the SC50 in more recent years that was basically the same scooter as the TaoTao ATM50-A1 and Jonway YY50QT-6 which does use a typical Chinese CVT and has the more common 139QMB motor. QianJiang scooter who made the QJ Baja SC50 as a 4 stroke also makes a 2 stroke motor version that is rebranded and sold under various names. For anyone finding this video and comment that has this Baja SC50 {Keeway Hurricane body style} with the QJ {QianJiang} anomaly engine and 1E40QMB Jog/Minarelli style CVT just remember that it is the variator with the 21mm inner slide bushing and 15 tooth spline that fits the Baja and the 15x12 rollers that fit the variator. I would assume the performance variators and clutch assemblies and springs for the Jog/Minarelli CVT's will work on the Baja too. You can get the stock variator parts and rear clutch assembly and springs here www.scrappydogscooters.com/50CC_2-STROKE_PARTS.html and the hard to find 836-17-30 CVT belt here www.scrappydogscooters.com/Replacement_Parts.html I'm not trying to promote their parts on your video and you can find these parts other places like ebay but anyone with this QJ Baja SC50 will have a hard time finding these parts especially the CVT Belt until they realize it uses the 1E40QMB Jog/Minarelli CVT parts so I'm just trying to help anyone with this scooter. One other thing the engine on the QJ Baja is slightly different but any big bore kit up to 72cc with the 47mm or smaller piston should work. The 80cc big bore kit being called 100cc by many sellers with the 50mm piston won't fit this Baja without enlarging the opening on the case. Also remember the variator rollers that come with some big bore kits are 16x13 and won't fit as the Baja uses the 15x12. The CVT gaskets that come with the kits won't work either. Shared this video to my facebook page Moped and Scooter Lovers too. facebook.com/mopedscooterlovers

You should be able to see if there's a major problem with the clutch since it's apart. If you don't see any damage, nothing is loose, etc... the problem may be elsewhere. For the knocking, internal knock could be a sign of serious issues or could be something very minor. Rotate the engine with the variator off to start isolating the noise. Check the stator side as well.

Thanks for the walk around! Love your builds!

Well today when on a ride the clutch locked up. The wheel wouldnt turn free of the engine. Pulled the cover off, sure enough one of the rivets that holds the centrifugal clutch shoe to the hub had broken. Repaired the centrifugal clutch pack and voila! she is perfect again. Vibration is gone, all is well in scooter land!

I learned a lot in this video.thanks u sir its very clear to me how u explain how to do service your own scooter.

This video is great! ....I'm having issues with my gy6 150cc. Have a Dr. Pulley hit clutch on it...motor and clutch have less than 100 miles. Recently it isn't idling at all...on a cold start it feels like the clutch is engaged...and the bike pulls a little then it dies a few seconds later...to ride I have to start it, throttle and go...if I get to a full stop it shuts off...and that's when I feel a lot of resistance.

Ha...Ha...that is the best discription i have ever seen on YT. Verry good job, greetz from Germany.

***** Hi, I have a problem with my Yamaha Aerox 100 2 stroke. When it is cold, it will accelerate really well even at low RPM. However, when it gets warmer (after 2-3 miles of riding) it will be really slow when first accelerating, but at higher rpm, it rides well (although not perfect). What I mean, is that when stopping and then giving it full gas, it does not want to go until about 10mph, when it hits the powerband and it starts accelerating, but, it doesn't over-rev, it just doesn't accelerate. The engine runs smooth and I've cleaned and check the carb so I'm pretty sure that's not the problem. I think that when I ride it, the clutch gets warmer and starts slipping. I checked the clutch drum bell today and it has turned blue/purple and also the clutch shoes seem to have gone orange and are quite worn. There's also a lot of black residue on the side of the case. Also, when I ride for a bit then stop, there's a burning smell - like burnt rubber or clutch. I'm pretty sure its the clutch, but I don't know which part of it exactly and the fact that it doesn't rev out when giving it gas makes me think it isn't the clutch. What do you think? Thanks, any help is appreciated!

Good video man... Reminds me of "MMM-HIM... LIKE THE WAY YOU TALK" THANKS FOR SHARING... GOD BLESS

Thanks for taking the time to do this, theres no manual for my bike and this is better than a manual.

Also that restriction washer you mentioned.... if my Areo 125 has it could I take it out to increase my top speed without screwing anything up?

I've watched a few of you're videos now and they all have really clear and concise information on every part you're working with. Thanks for all the hard work you've put into them.

thank you for this . really clear and informative .

Thanks a lot very nicely presented good one Perfect Now i got a scooter CF moto 150cc liquid cooled its has a problem with Clutch may be its broken or needs repair i have opened up the engine and have reached to the Clutch can u plz help me up for the clutch diagnosis repair or to fix it Do u have any other videos in this situation and also when the scooter was working it was making a knocking sound inside the engine. when i try to rotate the variator there is a scrashing sound inside the engine

My CVT cover has a gasket but I did not see one on your Scooter CVT Transmission : Full Service Inspection video. How important is that gasket? Is it necessary?

in the service manual i have for 1e40qmb it says apply approx 1.5g of grease per roller ramp. i didn't do that, is that a major issue? thanks again

OK I will do this before I ride next season, I made a video working on the CVT myself and I did not take apart the clutch assembly. I did sand the bell and the shoes though. It just seems like there is more vibration than I remember it does smooth out after a few minutes. Thank you again for the info and reply, is there a trick to greasing these parts or how much?

Great simple well explained video to follow and understand, thx for your time!, its not my scooter but it helped me get through without any problems,

Thank you very much for taking the time to make this video. Your work has gone a long way to help give me confidence in working on my scooter.

What about belt size. Factory 33 will a 30 works says fits most guy scooters cannot find a 33 anywhere.

Thanks mate I will recheck again.

A ridiculously in-depth step by step tutorial. They don't get better than this. Well done and thank you. I managed to do a full clutch service.

How many kilometres can I expect from a belt? I'm paranoid that I'll be miles from nowhere and the thing will break. I was thinking of carrying a spare but getting it all apart may be problematic if I need to carry all those tools. If I had an idea of life expectancy maybe just changing it every few thousand k's will do?

make the video with a regular scooter, dude! exiting out

Awesome video. Thanks

I get a little bit of vibration when I start off, I have taken my CVT apart on my Yamaha Majesty and inspected/greased etc, except the taking the clutch apart. Is this normal or should I inspect the clutch thoroughly? Thank you for your time

Thanks for sharing mate Really Helped!

23100-KFG-003 is the Honda part number. A Honda dealer should be able to get that. Google that number and you'll come up with some options that are likely cheaper.

I use 788 17 28 Bando belts. Others seem to like the Mitsuboshi 792 16.6, but I'm not sure where to find them. Stage6 makes a 797 17 28 I believe. Whatever you do, just don't buy the no-name Chinese stuff that's really cheap or you'll probably end up buying another belt before long.

Awesome!! Thanks

Thank you for the great explanation! P.S. Why would anyone give a thumbs down to such a video? 21 morons.

excellent video. I have a 1984 Honda Areo 125. Its a very rare model. I have a problem with acceleration until I get up to about 22 mph. then it kicks in and you hear the motor open up and it gets up to about 48 mph. Between 0 and 22 it just is a dog. I have a second scooter the same kind and it gits it from the start. What do you think my issue is if you don't mind. Thanks Billy

Well that's not too bad then. Didn't think they could go that long. I think I'll put on a new one and keep the other for a spare then. Thanks

I have a SYM/Lance PCH 50. I at least want to inspect my belt. Coming up on the 6,000 mile inspection. Seems like SYM is very unwilling help. My local dealer closed in January. The nearest dealer is 80 miles away. Any advice? MRP carries some parts. How can a company be so independent. Don't they want to sell a product?

Good learning video

Hello. It's me again. There is something squeaking on the transmission. I dunno whether the belt or pulley bearings. Thanks

I used to tear apart my cheap 250cc Chinese scoot to replace variators, belts and inspect the clutch. I now own a Burgman 650. Man, I don't want to even think about the clutch/belt on it. I guess why I purchased the 5 year warranty. Good video for those who may be a little intimidated for doing their own work..

i have just bought a yamaha aerox and when i set of the clutch seems to need lots of revs to engage, how can i make the clutch engage at lower revs? Also how can i improve acceleration?

I ditch the gasket most of the time, because there's nothing that needs to be sealed in or out for regular use. Sometimes starter setups will be picky with just the small amount that the spacing is off without the gasket though. One thing you can try to keep the gasket in good shape and so you don't have to mess with it is to apply a spray on gasket adhesive to 1 side. Use a thin film of grease on the other. It should stick to the case or cover but let the cover be removed easily.

Great video! I do have an old Suzuki cp 50 and the engine runs good but it will not increase speed/gear up... Any good solution?

I own a ZNEN L-Roar, the engine is GY6 157QMJ, the original belt that came with the scooter was an 835-20-30 ... I replaced it with a 842-20-30 and it was working quite well till it snapped after doing almost 1K kilometers, so i decided to replace it with the original size (835-20-30) and it snapped in less than 50 Kilometers, I got another brand and it snapped again ... now what could possibly be snapping these belts?

Man this was a good video

I think your variator should have 2 holes int he front where you can put something to lock it. The tool is shown in the vid, but you can make one with 2 metal bars and a couple of bolts that will fit into the holes, plus nuts to secure the bolts to the rods. You could also use a strap wrench to try and hold the flywheel on the other side while removing the vari nut. An impact and sockets are good investments though. Those will help with a lot of jobs.

what a great video mate! just the info I was looking for. thanks for posting. legend.

Thank you so much for the speedy response. I figured out that it wasn't the fan giving me the grinding sound. I am about to take everything off to inspect. Thank you again. I'm sure I'll be frantically commenting with you very soon. LOL! :)

thanks for taking the time to make this video! awesome!

i have got a terrible sound coming from clutch when starting.... after 15 second the sound slowly disappearing to the minor sound ..do i need to change the clutch pads or clean the clutch with sand paper

Are you saying to put the grease on the pins and then insert them and then fill in the holes at the end and then reassemble it

good video

thanks mate, very informative!

This is good for our customers to know about the servicing.

Great video very helpful thanks

It's thanks to people like you that make in-depth videos like this full of knowledge that other peeps can fix their scoots. Thanks a bunch, man!

i have a horrible vibration coming from gearbox shaft the one with the clutch and bell bolted to it,i looked at bearings and they seem ok,what movement should the shaft have because if u turn back wheel every now and again i can see the shaft and clutch sightly wooble , on a peugeot speedfight 2 ac

Hey there, I really like your videos on the gy6 scooters/project tao tao they have helped me a lot in servicing and learning about my scooter. I have a qmb139 moped and I have a question relating to the transmission I was hoping you could help me with because you clearly know every inch of these scooters very well. Here is a video explaining my problem drive.google.com/open?id=0B8knBHrxPBNpLUpRM2EyUFRKdW8 Any input would be appreciated, thanks.

i mistake use lubricant spray wd-40 all my scooter CVT transmission..make terrible slipping...so now i try use braker cleaner spray..is it will be ok?

Could i sandpaper the scratches away with fine sandpaper or will it affect the stability of the variator?

Good video no no BS yackety yack just the stuff you want to know! I love it!,👍❤️

Thanks for this. Brilliant advice, not just on how to take apart, which is what so many do, but explaining to the layman what you need to inspect, and not replace if not necessary, regardless of what the book says.

Definitely pop the cover and check the belt. I've had belts go just like that with no crazy noises. I put a link to a vid of it happening with a pic of the destroyed belt in the description.

You seem to know quite a bit. I have a 90cc atv with a similar clutch set up. Almost identical actually. As far as i know its all original. Some times it takes off aggressively and other times its real boggy and hard to get going. It can't even get its self up a small incline. My roller weights dont have any flat spots at all. The variator seems to work when i have the wheels off the ground but when riding the variator hardly raises the belt up at all. Now looking at the clutch its self all the springs seem to be good and strong. The clutch bell is purple and blue due to heat. Im insure what to do from here. I did notice the shaft that the clutch slides on has side to side play could that be a issue?

hey there, ive got a 150cc gy6 scooter and when i pulled the cvt cover off the belt was very tight around the clutch and variator, the bike used to do around 60mph now it does half that, could this be the reason? Thank and great video by the way!

very informative. I enjoy how your videos are always formatted in a straightforward easy to understand manner as well. thanks for what you do!

Something may not be right in the variator. Roller(s) out of place maybe. Is the belt the same specs as the one it replaced?

Best Video on the web...Thanks for your time and effort. I have a problem with a noisy engine but cant get the cover off at present. Could you kindly have a look and listen and give us your opinion on what may be the culprit please? (Hopefully not big end!) Noisey Piaggio Xevo 125cc 15k miles

i got a 96 to a 98 jog the back tire speeds like crazy but once i hit the back break to stop the tire the jog will die out like it's stuck in a gear. the belt is new. anyother idea what it could be...onley other thing i can thank of is the clutch... but im not sure???

Lol 😂 god bless you i watch you from long time be safe and stay home

Thank you for your videos. Having spent a little fortune to have someone change the belt after it snapped. You have give me the confidence to DIY it next time. I'm even planning to order a high-speed pulley. :)

Thanks for your videos.factory belt broke on my jiajue 49cc with only about 942 miles . 669- 18-30 . Belt was a gates belt . found 3 of the 6 weights in sideways . cleaned it. Replaced belt . only thing ive lost about 4mph on top speed . pulks fron stop takes off better . on downgrades its much faster and engine doesnt whine like before . did weights cause belt to break? Any thoughts be apreciated . have no idea weight size . thanks

Hi, I have a question about all the springs, what do they do and what is the best for performance for a 50cc moped, I'm a little confused on which ones I should use for the best performance

Awesome! My wife's scooter died, and it turned out to be the drive belt was completely toasted. It was a mess in there, but with this video, I was able to get in, take it all apart, clean things up and get her back on the road! Thanks for sharing!! Respect!

I don't know much about the stand up scooters, but Blade Z's site carries belts. Blade Z Scooters dot com.

Hey man, i'm really unlucky since my GY6 threads on the lower bolt that the variator tool would fit on is stripped and filled with high head expoxy since the hole went straight in the the engine and would eventually leak from the hole, so i thought about using an Electric impact gun for the variator nut, only problem is i cant find 30ft lbs torque sticks, I can only find 65lbs as the lowest, which i know is too much.. So if i would turn the nut on by hand as much i could on the variator, then hit it briefly with the impact (not holding the trigger down for more than a split second) could that be sulution to get the variator off and on safely?

thank you very much! :-)

Best tutorial on CVTs on RU-vid.Very detailed and helpful.

I have some questions for you about the cvt of a 2013 Honda ruckus that I have modified is there away I can contact you via email

hello all.i have a 2008 il bello 150 flyscooter that has had recent work done (new belt 5 months ago and is now making vibrating noises at around 30-35mph..i can feel it in the seat and it it makes a humming whummmm whummm whumm whumm like its "winding out" no performance loss just noisey!...could the variator be shot or rollers worn out? they were replaced a few years ago prior to the belt being repalced. also, what is standard roller measurement and weight?

Thanks I know how to repair a scooter now,take that you Capitalist.Also I never use adblock,unlike most of your free loading viewers.I also didn't press the skip ad button.

Nice job, I've used a HF oil filter wrench to hold the variator in place on my 4 strokes. They have one that locks like vice grips too.

fantastic video thank you very much for sharing

Minarelli is an engine type, 1E40QMB is a copy of that. This engine was a copy of a minarelli.

zanx, i can't seem to take of variator to check crank case on my suzuki sj50qt. there's this spring lock cover that covers the the variator nut and i can't take it of the shaft to get to the variator nut. any advice?. it's driving me crazy..........

One thing you guys have got to learn is GOOD ENGLISH! It`s hard enough for 90GTV to answer your questions remotely, but how is he supposed to know what you are talking about? Grammar and SPELLING ! Please have someone help you.

best video ive seen about cvt services

The little A shape slider's always first to go sounds like gravel.. 4 gram rollers and less than 30 miles on a brand new front and rear variator CVT set up

Great video. x The drive faces are rusted, so will a fine grade sandpaper be ok??

so i am assuming that a longer belt would give you more topspeed?

If I was to remove the restriction from the clutch/variator would it get more top speed or faster take off ?

3 days from buying a SCOOTER It fails. Brilliant video on what to expect in the transmission. Sorted problem - broke the sheave plate but new one on order. Will put together for the weekend. Thanks.

Whats the torque on the varator nut and clutch not on 50cc?

First class post! Covering every detail, I'm going to attempt this for the first time on my Aprilla mojito 125 cc in the next few days. This video will be right by my side. Excellent tuition, will let you know how I get on.

Hi am new at this just got a velocity 150cc and variator keeps closing up and causing my belt to rip up what can I do stop that and hoe do I reopen the veriator ?

My clutch failed belt broke and variator ate itself always something when im outta money at least it was only three point nine miles from home when it came apart 😐

So can my 50cc taotao(49.99cc) go from 35mph limit to like 40-50? If so can you show me how?

Well it was running fine til other day I was at 45mph and it backfired and bogged all way down. Now it will only let me give it little throttle go up to 10mph any more throttle and it cuts off. It idles perfect. Thank u for your response

Hi, i think I have the same engine on my scooter but I cant find anything on internet about that engine (service manual etc.), one thing that I know is that from factory it has 80cc and little larger shaft of the crankshaft on the clutch side so when I tryed to upgrade transsmision it couldnt fit because it was smaller. Do you know any site where I can find more informations? And sorry for bad english

Hi. How many miles should u get out of your belt