Scooter CVT transmission explained

Scooter transmission tuning and cvt explained. Description of all the cvt components, what they do, how they work, and how to diagnose and tune. Cvt, is 90% of the tuning process in my opinion
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[@ΚωνσταντίνοςΜπιντας]

I am 35 .. I am driving scooters all my life, address ,gillera ,vespa,beverly , liberty... First time in my life i learnt how scooter transmission work ! Thanks bro .

[@BennyVanrompaey-we4ge]

Til now sorry must se it

[@bajafins]

everything is so clear when you get a real demonstration! I had looked at pictures and text explanations for a while but coudn't really imagine how it really worked... Now I understand why they say a CVT has essentially "infinite gears". Thanks!

[@Scooterswapshop]

Glad it was helpful!

[@BattShytKuhraezy]

... infinite-WITHIN-RANGE♾️

[@franzeleefrancis]

i learn much more from you than a 8 hour pay per class,Thank you.

[@Scooterswapshop]

great to hear may wanna check out our members side of things

[@beamngnation9494]

damn, son, there are some smart ppl who can invent this kind of stuff. Engineering is incredible!

[@Scooterswapshop]

yep

[@melmskilemz6307]

The cvt transmission was invented over 100 years ago

[@beamngnation9494]

@@melmskilemz6307 still is amazing regardless the time its been created

[@caseymyles7202]

you all prolly dont give a shit but does any of you know a method to get back into an instagram account..? I was stupid lost my login password. I would love any tips you can give me!

[@colemayson1164]

@Casey Myles instablaster =)

[@davis9045]

Very well explained! Even the smallest things in transmission can make a difference in performance. I've bought my second scooter - 2013 Aprilia SR50R (carb ) and I''m rebuilding it to 70cc ,i did rebuild my 1st scooter Yamaha Aerox to 70cc too ,but only changed the pipe, cylinder kit and air filter. It ran good for the small amount of tuning i did. But the SR50R i'm tuning a lot more -sport transmission ,Yasuni pipe , streetrace 70cc ,bigger carb ,intake etc. ,thanks to this video I learned a bit more about transmission tuning. I'm surprised that in USA the scooter tuning is also popular. I'm from Europe (eastern europe - Latvia) and here it's a very popular thing amongst teenagers and even adults. You can pass the moped exam if you're 14. ( I'm 16 btw.) We even have a scooter forum ,official scooter meetings twice a year (10 or 11 years since the 1st one) with cast-iron and aluminium class drag races , and a lot of scooter riders upgrade their rides a lot to win those drags..even porting cylinders and engine blocks. In the past I thought that in USA people only put 150cc big bore kits on their 4 stroke chinese scooters and that's all with tuning :D but I'm surprised that there are 2 stroke powerful builds with all the known brands - Malossi ,Polini , Stage 6 etc. A subscribe and like from me.

[@Scooterswapshop]

Thanks

[@mr_rage_94]

This video is verry informative and it seems ro be hard finding that on youtube for scooters i have Peugeot speedfight 2 100cc but im lost knowing what parts to get for tge transmission 😂

[@supergreen5308]

This was far easier to understand than those fancy 3d animations thanks man . Lv from india

[@Scooterswapshop]

no prob bob

[@LarryWebb-g5d]

Super cool video, I didn't know I could run it with the transmission cover off , I have a stock Wolf 50cc scooter very low miles and it started making a squeak noise during initial throttle, it sounds like my belt is slipping a little bit until I get going , after watching this video I'm confident I can fix it . thanks

[@leelee3995]

What an incredible and interesting explanation of how the CVT works.

[@Scooterswapshop]

thanks !!!

[@robertgossas3711]

Recently bought a scooter and been searching for this video for some time. Good job explained all ive been wondering about. Keep up the good work. 👍

[@Joeak74]

You are OUTSTANDING at explaining things!!! Thumbs up! Those Polini engines kick ass!

[@Scooterswapshop]

thanks!

[@koustuvganguly]

Now I know the thing completely .. Best and most detailed video ever made.

[@Scooterswapshop]

Thank you so much! Make sure to share the videos and channel to help us out

[@koustuvganguly]

@@Scooterswapshop Already did that..

[@RE-RotaryExperiment]

Finally, someone who can fully explain the functions of a CVT! I have a V-Moto Milan II 50cc and from the sounds of this video, installing all those components is possible, am I right? I'm in Australia and I've hardly seen any modified scooters in Adelaide...

[@eeiippabdoukarmosman8317]

eofkhj

[@RE-RotaryExperiment]

Eeiipp Abdou Karm osman KZbin... Are you trolling me?

[@toddcullen3828]

I also have a vmoto Milan, 70cc eBay bore and piston, eBay expansion pipe, #80 main jet, I was having trouble with it bogging on take off, after pulling it all to bits like a million times, I eventually found the variator had a destroyed roller that was jamming it in top gear, I removed the dead roller and now no more bogging, I have ordered a eBay variator kit

[@Scooterswapshop]

glad to help

[@azzmann112312]

Wow! I am going back to the Philippines and planning to buy a NMAX Yamaha scooter.I always wanted to know how it work and thanks for your vlog now I know...

[@Scooterswapshop]

Glad I could help!

[@zacharyjurecek178]

I love this channel. So much learning and fun!!! I have a 2008 Zuma 50 2T I been overhauling with yalls videos. Thank you

[@StuartAJohnson]

Great video explaining the variator and clutch. Super helpful to see it in action too. Thanks, really informative.

[@Scooterswapshop]

Glad you enjoyed it!

[@ep3_chris234]

Dude great job on the explanation confidence level went up after watching your video Thanks

[@tapecknows]

Thank you for this video! I've learned a lot and I'll be applying it to my XMAX 300 when 12,000 miles come!

[@Scooterswapshop]

Glad it was helpful!

[@genegoodwin8925]

I don't own a scooter yet, but I plan to. I'm an old motorcycle rider who has to ride a trike due to my wife's many health iseeus. But I am now looking at scooters for the amooth ride. I think the engineering that went into a scooter's cvt is amazing. It is so simple and yet works so well. Your video does a great job explianing how they work. I will probably change the clutch springs on whatever scooter I buy. I will install weaker springs becsuse I want the clutch to engage sooner than stock. Then I will look into the rollers to make sure the front pulley is giving me the max it can give. I don't know if I will change the spring on the rear pulley because it seems to me if I have the right weight rollers in the front pulley it shoud over come the spring in the rear and give me the maximun performance. Well, good enough for me anyway. Thanks for such a good video on a scooter CVT and thank you for removeing the cover and showing exactly how they work. I already knew how they work, but it was nice to watch one while it was in action.

[@ludeboukema4111]

this is the point i know you know its a nice feeling plus the sound of the engine is also to my heart

[@Scooterswapshop]

right on!

[@bhaveshpawar4826]

A very good video.. i am searching for scooter engine working video , i got this in 2 to 3 days after it......good explanation..

[@Scooterswapshop]

thank you

[@Jflowboston1]

Great vid, I'm fixing my friend moped and found the clutch variator destroyed, thanks

[@Scooterswapshop]

bum deal bud

[@chrls653]

The best Explanation I've seen here in youtube so far

[@Scooterswapshop]

glad to hear!

[@mokebang7526]

Thorough explanation. Appreciate it!!!!

[@Scooterswapshop]

Glad it was helpful!

[@motorized2105]

I talked to Paul today at your shop, cant freakin wait to get my 08' zuma flyin down the road! Im thinkin about ditchin cars and start fixin up scooters

[@Scooterswapshop]

do it so much fun and things are so much more affordable!

[@jesam1711]

Gotta love the sound of a well-tuned bike. 2T😍

[@ursmalo3103]

No, sounds like a coffee grinder and stinks like hell

[@youthinasia9523]

@@ursmalo3103just like you're mammy

[@Scooterswapshop]

its fun for sure

[@Scooterswapshop]

@urs malo you are on the wrong page then hahah

[@bramvandenbroeck5060]

Amazing video, full of info that a normal person can understand!

[@Scooterswapshop]

Glad it was helpful!

[@elzirgl7584]

Wow thats nice man actually i understand everything the way you explained and i also assembled those scooters in the philippines like honda dio mostly two stroke that was way back before and have a knowledge in putting those things for racing but financial is a big concern on our side that time so....but hope someday....hehehe thanks guys

[@Scooterswapshop]

thanks!

[@wickedbob1]

Thanks and very nice of you to explain and even show how CVT works. I am new for this type of transmission and I have a Romet GT125Mx and I have a problem when it comes to stop and start to move in a ramp especially when having a pillion. the scooter is very sluggish to get going. what can I change and which things should I rerplace to get it better. Thanks once again.

[@richardcooper5524]

So x 1000 = this guy!

[@Scooterswapshop]

thanks

[@Vidya1939]

U r video is very useful to me, my back wheel was roasting but now not rotating ,I don't know what kind of problem until unless I open the cover ,the way u opened, & see what is wrong with transmission .many Tks for video

[@Scooterswapshop]

Glad it helped

[@mustseenow991]

great explanation.. your voice needs be louder from beginning though...

[@Scooterswapshop]

thanks

[@vinaypatil2844]

Appreciate your time spend learning the dynamics of it and enlightening us❤

[@fractalofgod6324]

Wish I could buy this cvt kit for my 2017 honda forza 125 cc

[@mediaSophia88]

Wish I could have you to fix my Scooter. You have been very helpful in your video.

[@tomsku69]

Can you tell the most common reason(s) why belts wear out (way) too soon?

[@nestorjoseperez787]

Bad setup! Bad components

[@nestorjoseperez787]

Dirty components and casing

[@Scooterswapshop]

something is wrong

[@zeiden2508]

This is such a genius idea. Is basically all centrifugal force that is so clever.

[@Scooterswapshop]

been around fo many many many years haha

[@zeiden2508]

@@Scooterswapshop never said it was a new idea. Haha

[@ΓιωργοςΜερτζανακης]

very good explanatory video And with very good image and sound quality It is a mobile phone or a camera thanks

[@Scooterswapshop]

thanks make sure you subscribe!

[@JeffBassir-lo6zj]

I'm new to all this. My new 150cc scooter seems to engage a bit slower than I would like it to (manufacturer says it engages at 1700 rpm). There seems to be a bit of a slack in the throttle. How can I make it so the clutch engages quicker? By adjusting the throttle cable? Or by getting 1000 rpm clutch springs? If I change the clutch springs to 1000 rpm, do I need to also change the contra spring to 1000 rpm? How about the variator rollers weights? Do I need to change them to lighter weights as well?

[@alponso8149]

Now i know how my scoot works 😁

[@Scooterswapshop]

congrats

[@MrDavid6428]

Best video ive watched from you guys, tons of clear info. No amped up dudes on enrtgy drinks talking about their little weenies!!

[@Scooterswapshop]

we have to entertain. videos of only tech stuff would only have people watching 1 video every few months to years so keeping entertained while adding info. But thanks we have plenty of these!

[@kingneutron1]

Really good visual explanation :)

[@Scooterswapshop]

thanks

[@johninokla2635]

Good video, you made how the CVT works simple to understand.. The only complaint would be how many times you said "So." It got a little annoying after awhile.

[@Scooterswapshop]

We are So So Sorry. No one is perfect, I would advise you to try making a video like this and see what you repeat its. interesting test

[@Snailmailtrucker]

Excellent presentation and content ! LIKED/SUBSCRIBED !

[@Scooterswapshop]

thanks did you subscribe?

[@Snailmailtrucker]

@@Scooterswapshop I thought I did 2 years ago...but, I did again today to make sure ! *MERRY CHRISTMAS* ! *LET'S GO BRANDON !*

[@guyspanky7007]

When I first found out about this type of cvt was about 1950. Salsbery motor scooter used them. It was the fastest motor scooter on the marker at that time top speed above 70 MPH. Honda bought out the rights to that cvt and put them in their Honda dune buggies about 1970. I had 3 of the buggies. The cvt only caused trouble when it got wet. I had to push it out of a river bed.

[@Scooterswapshop]

ok

[@potato4358]

How many RPM do you have on your clutch spring and center spring?

[@Scooterswapshop]

so this one is a full race build, stage6 medium and stage6 race clutch springs. it engages around 9500

[@LarryWebb-g5d]

Does a stock Yamaha zuma muffler flow pretty good ? The reason I ask is I like the sound of the Zuma's stock muffler. I was thinking of installing a zuma muffler onto my Wolf booter

[@jackrutherford-1]

I think you could've done that whole video with the camera in the tripod.

[@Snailmailtrucker]

Excellent suggestion...this Video would be Perfect....It's great as it is...but it could be Perfect !

[@fintonmainz7845]

No. A fixed canera wouldnt have shown everything.

[@jackrutherford-1]

@@fintonmainz7845 tripods are not fixed in place bro

[@Scooterswapshop]

Was hoping you had made one. but you havent bummer.

[@Stevesbe]

The variator kit was the best thing i did to my pre bug zuma

[@Scooterswapshop]

one of the biggest changes

[@josephnimako8619]

He made this vid to flex off the burnt titanium drive face 🤣🤣. I’m joking but nice vid I’m gonna start working on mopeds my self starting with my Aerox

[@Scooterswapshop]

we can sell you these things so you can flex

[@AmbeChannel]

nice video.. have also got 4 scooters right now and also share some works related to them.. lets share our experiences so that more people can benefits from it. TQ

[@brandonwarren8351]

How about a bbk install video? Let's see how easy it is.

[@Scooterswapshop]

B DUB sure thing! I’ll do that next: been looking for an excuse to put one on my recently purchased dio :)

[@phatmanxxxl]

It's not too hard, if you done it before it can be done in about an hour or hour and a half.

[@brandonwarren8351]

phatmanXXL yeah it was super easy!! I'd say about two hours for me.

[@thunder6912]

I have a question, my cvt belt was worn out from 17,5mm to 16mm. but I ordered and installed 18,5 a thicker belt, I added some shimings in variator so the belt would stay as low as possible and it was as high as high in the rare (clutch plates). but it's still the same belt doesn't go all the way up on the variator, I squeezed the belt in the clutch as much as I could And I THINK THAT MY CLUTCH DOESN'T LET THE BELT GO ALL THE WAY UP 😫😫

[@mathewsuddath210]

That is so damn cool!

[@Scooterswapshop]

thnaks

[@alibabaei1953]

No constant oiling needed as there are no chains. has simple parts. unlike cvts in cars, cvts in motorcycles are super reliable as that rubber belt has way less power to manage than those poor metal belts in cars which have to transmit at least 100hp to a 1.5 ton car. has no problems with crossing waters as tranny has its own cover. cheap to own and cheap to maintain. easy to use and comfortable. scooters are awsome

[@dannyeden6244]

may i ask how are the rules for you in the u.s. because i love to work on my scooter its fun and "relaxing some times" but if my scooter makes it to 80 kmh/ 50 mph they will take away my license and if you really unlucky the also conficated your scooter here in the netherlands. and what i always show the cops is he orignal manual from my piaggio typhoon. it says at 50mph atleast keep about 10m/33ft from the car in front of you. and they just say that its not true.

[@FACTOTUM_55]

Us and Canada if you have a motorcycle lisence (even a beginner's) there are no limitations on which motorcycle or how fast it is. There is limitations on when and where you can ride and writhed or not you can have a passenger. Until you're fully lisenced.

[@2wm699]

In the uk we are restricted to 30mph but no one follows my advice is don’t get caught

[@Scooterswapshop]

Zero speed rules or cc rules

[@pemsalvan2464]

Your 2 stroke engine sounds awesome!

[@Scooterswapshop]

I love it!

I like CVTs in scooters, ATVs and snowmobiles but in cars I hate them. Mine blew out right after ended warranty what bullshit. Not cheap and easy but the opposite.

[@markjulius2006]

Excellent video. Can you explain the pros and cons of rollers versus sliders? Thank you.

[@Scooterswapshop]

we have many videos dr. pulley has the best explination

[@1987bostonredsox]

Just subscribed! Awesome video bro!

[@Scooterswapshop]

you still subscribed!?

[@jaker3246]

Hey i have a 98 prebug im wondering what causes the belt to shift before the clutch engages. My belt starts going down on the rear pulley before the wheel starts spinning

[@sherwinsalvatori6997]

I wish you had worked on my bike , ,maybe know I would be able to say I have one , instead of scraps

[@kevinstearns4198]

i used to say that keep watching videos u will be awesome like me it aint shit. electrical can be a royal fukin pain in the ass. just keep watching videos when a paticular area on ur scooter fuks up.

[@burrito9720]

Imma try to salavge and make it like a torque converter

[@Scooterswapshop]

SEND IT HERE

[@predator_boiz336]

What are good cvt upgrades to run in a 139QMB? Like what’s a good clutch? Good variatior?

[@lorabenz]

iam a heavy dude 135-140 kilo and i got a stock 50 cc scooter whit me on it its slow starting up but ok in top speed, how or what do i chance to make it faster in the start up ???

[@Scooterswapshop]

You need more hp to go faster If your a heavier fella

[@safaayda6333]

9-10gr roller or HP engine

[@sehsuan]

this was a very nice demonstration! must have been tough taking the video with one hand on the camera though!

[@Scooterswapshop]

Yes, thanks

[@dwiwahyu7638]

Just disassemble the cvt and you will know how it works believe me that's what i do :D

[@michaelmcgee3358]

Lol, this is what I do while on meth

[@vincentleviangelomagbojos5241]

@@michaelmcgee3358 lol when im high in weed i prefer to tinker out my cvt 😂

[@Scooterswapshop]

ok

[@Tax2Me]

That’s really good explanation followed by a visual demonstration. I know better now. Thanks man

[@Scooterswapshop]

Glad it helped

[@markallancruz7428]

On earth we call that torque drive

[@Scooterswapshop]

NICE!

[@caseyhanas3311]

Damn good explanation, no doubt, with great visuals to boot. However, you left off at a crucial point of understanding, the rear pulley... PLEASE make a rear pulley video as good as this one! No point in purchasing what I don't understand, yet.

[@attilasaghy9747]

Thanks for this. Do you have any idea, why is it that: on my scooter when i start mmoving with the bike at the beginning its shaking the whole bike for a few seconds and then its smooth again at a higher speed. So its shaking at the beginning of the speed up process, is the clutch spring not ok, or the whole clutch worn and not cathing the clutch house properly? Do i need to replace all parts or just spring or other parts?

[@David_Williamson]

That was super helpful, i understand my bike now. Thanks a lot bless your heart.

[@Aj-om4dt]

Was that originally a stock horizontal minerelli engine? I have a Yamaha BWs cw that I want to put a horizontal minerelli l/c engine into with all high performance internals & don’t know weather to just buy rc one 70 cases instead??

[@brianrobinson1637]

Best explanation I seen yet! Great work guys.

[@jmracer86]

I have a 2003 yamaha bws, did a brake stand and it started to wheel hop. I developed a vibration and eventually lost drive. IS it usually a belt that snaps or the cvt went to shit. I still have to take it apart to have a look.

[@Deoge4]

I've got 6.5 and 8.5 gram rollers in my 50 cc zummer gy6 taotao now it's going 45mph on straight but sometimes it bogs down why,?? And I have ten gram rollers coming Monday so I was gonna take the 6.5 gram rollers out and put the ten gram rollers in should I or no

[@pixzzas10011]

I just learn little bit more about cvt. Awsome!!!

[@Scooterswapshop]

great to hear

[@uk_familygreen]

Great video..changed output shaft and seal on malaguti f15 rr 69cc. Used to do 50mph. Changed belt and rollers at same time. Now moped only goes to 30 but nice and 20 up a hill. Any ideas? Old flat rollers were 4.8g. tried 6g, 4.7g and now 4g.

[@Scooterswapshop]

Nice work!

[@turboflush]

How do you know where your new rpm would be after upgrades?

[@dante1440]

Nice workshop, I'd like to have one like that:) How long does the belt last?

[@jodie4609]

As a woman I appreciate the details in your explanations I have a question as well Is changing the top speed of a 50 cc to something higher have a physical effect on the bike

[@Scooterswapshop]

I mean it makes it faster but not sure the exact question. you arent ever making it crazy faster

[@jodie4609]

@@Scooterswapshop lol I struggled with it my self lol I guess I'm asking are bikes designed with a particular speed in mind is a 50 cc bike designed differently than a 150 cc If so does the bike operate differently at a higher speed

[@johannis8483]

Hi..nice vid. Wanna ask you if mine use 135cc What is better to modify the roller and torque spring.. should I use heavy weight and 1000 torque spring.. Daily use in highway..tq

[@Scooterswapshop]

thanks

[@whitedove3436]

Any idea how to solve engine lugging? Im satisfied the acceleration and top speed on my scooter but the engine lug is terrible

[@lenkiatleong]

Best video that explains how CVT works in a scooter. Thanks.

[@Scooterswapshop]

thanks!!!

[@chaver28]

does changing the drive face make much difference?? new to bike and tuning so sorry if this is a dumb question

[@Scooterswapshop]

a little we explain it in our videos

[@ssko909]

What is the perfect weight for rollers to get max speed? I already changed my cluthch springs to race springs.

[@Scooterswapshop]

There is no perfect weight every b ike every modification is going to be a factor. we just uploaded a video and paul talks about how to factor and adjust for that.

[@jasonsmith1714]

Hi Should the crankshaft lock? Their is some play moving it by hand or should it move freely? Just ordered new belt as old one was loose. Thanks Great Vid

[@Scooterswapshop]

negatory should have resistance tho

[@thomk9767]

Very helpful! Thanks so much for the thoughtful presentation!

[@predator_boiz336]

So if my bike is only hitting about 8400 rpm’s and holding when I pin the throttle, what can I do to make it hit a higher rpm and have more speed? I have 1500 rpm springs, and I’m running 5.5 gram rollers or 5 gram one of the two, the bike is a 139qmb with a 50mm bbk on it , just a free barn find I built to wheelie but it’s really got me into scooters and I really wanna understand how to easily tune; bike will only do 41 mph @ 8400 rpms

[@nelsonlayosa8583]

Is it ok to spray some belt dressing on the V belt just like in other machineries and when to aplly it?

[@Scooterswapshop]

Never Ever spray anything on it why would you even want to the belt would slip causing to go slower...

[@predator_boiz336]

So my belt is raising above the variatior, what do I need to do to get it to ride just at the top

[@vincemaxim]

Any suggestions on how to fix the deteriorating speed going uphill? What are those clutch parts that need replacement? My scoot is a Suzuki Nex. TIA.

[@Scooterswapshop]

shed weight from you or bike

[@LarryWebb-g5d]

How can I control the throttle if I'm down there looking at the belt ?

[@johnpro2847]

13:10 mine sounds like cicadas on a hot summer night when decelerating ..same as yours but lounder. How to stop this racket if possible ?

[@03455322211]

Good stuff. Why did you put the cover on and start it? Is there any reason for it ?

[@Scooterswapshop]

Because it’s kick start only

[@DL30Creations]

Just bought a Benelli Andretti X50 and about to rework it for better performance and speed although these stock were beasts already.

[@Scooterswapshop]

nice

[@ninoechavez1402]

Hi man what do you call that adapter on the rear shock nut that you can use to raise the scooter with a paddock stand?thanks

[@Scooterswapshop]

The standoff?

[@ninoechavez1402]

@@Scooterswapshop yup

[@ninoechavez1402]

Hi man. Another question, got 5g sliders on my stage6 vario and belt on the rear pulley just sits nicely near the top. However, at WOT on a sharpie trick i doesn't seem to ride high on top of the vario and left about 10-15mm mark. SHould i go for heavier sliders? Like 6g? Got 1500 torque and 1000 clutch springs on 70cc stage6 cylinder and sports exhaust.

[@qayyvm]

Hello!! Very great video.. Very clear explanation. Anyway just want to know why do you use Polini? Im still looking which one to get. Polini or Malossi? Any tips? Im riding Yamaha Aerox 155cc

[@Scooterswapshop]

we use both

[@secondfloor2800]

Is it true if you put balls bearing between contra spring and pulley can make more acceleration?

[@Scooterswapshop]

Not typically no

[@bobfuzzy3342]

Can u also get a thicker belt to reach better performance?

[@Scooterswapshop]

possibly all depends on the bike

[@iamrishio]

Are CVTs on scooters reliable or do they break often compared to manual transmissions on motorcycles?