Scooter shaking at high speed. Please help!!

[jakobythegreat]

I'm having serious problems with my scooter shaking at high speed and shredding the belts. I have a new belt, clutch, and variator. Its like a thud thud thud noise and I can feel it. It's only after I pass a certain speed but I know it's not the wheels because that wouldn't effect the belt right? I also have marks on the side of the belt like it's slapping inside the cvt but I don't know how to fix that. I've literally tried everything. Even thought my crank was bent so I even replaced the crank. Only thing I haven't replaced is the output shaft to the rear wheel but I've inspected it a million times and I've seen no wobble or bend in it so idk. Please if anybody has nay advice or ideas I would love to hear it. I'm out of ideas....

[pinkscoot]

I have to say I opened this because the title "Scooter sharing at high speed. Please help!!" intrigued me. But it was just a typo. It happens to me all of the time.

Is the belt the right size? Are you sure that when you tighten the variator that the belt isn't squeezed into to it and not allowing you to tighten it all of the way? These are all common mistakes that could cause your problem.

[jakobythegreat]

Sorry about that lol. But yes I've checked over and over to be sure it's not that. I can start the scooter with the cvt case off and the belt is riding smoothly so I know nothings cockeyed. It's also a new belt 669x18 something. I have a short case 1p39qmb with 10inch wheel so I know the belts right. I've ordered a million of them cuz I can't find the solution to this and it keeps busting belts.

[tortoise2]

Oct 29, 2017 9:55:35 GMT -5 jakobythegreat said:

scooter shaking at high speed and shredding the belts

Based on previous postings . . engine is significantly modified!

[kagetenshi]

Just a thought, have you individually weighed the rollers your using? Some rollers come a bit off from the factory. That could be causing your variator to wobble at higher speeds if they are off by too much from each other.

[matt2015taotao]

Swap that 2000rpm spring out with something softer. A tight spring will so exactly what your experiencing.

[twitchytoes]

I have some bouncing when I ride too but mine feels like a flat spot in one of the tires and mine was sitting for a significant period prior to my buying it. I haven't done a 100% inspection of my tires due to my poor vision and having not seen a flat spot before, I don't know what exactly to look for but I am having someone else look them over, and I'm gonna be weighing my rollers to get sliders in there soon as well. I'll let you know if I sort mine out and how I did.

[cagiva4ever]

Seriously, Read the rear CVT post from couple weeks back and look for "front fork topic"

there are answers to your issues. you have at least separate 2 issues...and your are Overlooking 1 of the basic faults at china scooter...

quick find them from my post database, faster.

[jakobythegreat]

Well I just got off the hospital today. I got 2nd degree burns on my legs and upper body. It blew up on me on my way to work. The scariest thing that has ever happened to me. Please you guys be careful. You never know what can happen

[lostforawhile]

the engine blew up on you? didn't you install a BBK on a stock crank and bearings? glad you are ok though, this is why when I do a BBK I'm spending the cash on a quality crank first, so I have to crack the case, if your foundation of the crank and bearings fail, then noting else is worth spending money on, and when the crank bearings fail,causing it to throw a rod, this can happen,  can you take pictures of the carnage for us? this can be important information as to exactly what failed, or what may fail. When you recover of course.   

[bullcharles1]

Woah yeah would love to see some pics of the scooter. What failed??