Chopper Vibrations

I just got my schwinn stingray chopper project done. it took a while to get used to it. very different than a cruiser or mountain bike. ive got a 66cc, with fancy tailpipe that shoots out the back im using a two wheel tensioner system for the chain, its a larger chain i think 410, not the real big 415..i built a 26 inch wheel for the front, to make the bike look bigger and add a little pedal clearance. its got craploads of torque, but suffers at topspeed. it will manhandle a steep hill faster than a cruiser .. i havent clocked it with a speedo yet but i plan to. it feels like it tops out around 20mph or so, but at wide open throttle i get these huge vibrations that shakes the whole bike and my poor arms lol it really kicked up my carpal tunnel syndrome from reving it up like that today. i know that it still has to be properly broken in and everything, but i wonder what i can do to calm these vibrations down, more rubber? maybe if i get the vibrations down i can add a couple more mph's to the top speed. anyone have a chopper that vibrated you half to death at w.o.t.? what did you do about it?

theres just a small less than a 1/8 inch thick piece of rubber under the bracket and the front bolt has a clear plastic tube around it to keep from scratching the frame. could this be causing all that vibration? i would like to get a smaller sprocket but would it be harder to start?

@ fatdaddy im gonna take your advice, on your choppers, what kind of a sprocket did you have on the rear ,of the ones that did 30? this thing is really awkward to pedal until you get the motor going, does a smaller, say 36 tooth make it even more difficult to start?@ 2Door im not really worried about the paint if it doesnt move you wont see any scratches. im going to pull that rubber piece out of the bottom and the clear tube from the front u bolt..i can get the same color paint and touch it up which i need to do in some spots anyways.thanks guys for all your help. ill let you know how it does without the rubber.

maniac57 said:

The smaller sprocket made starting slightly easier due to the motor spinning faster at normal pedal speed.
Try it, you won't regret going smaller. (unless you live in a very hilly town)

Click to expand...

actually I DO live in a very hilly town, the way the chopper is set up though it climbs these hills like a beast..will the smaller sprocket have a big impact on hill climbing? i could imagine it would cut the torque down a little but i would still think should still climb better than a cruiser with a 26 in back wheel

wow, the difference is like night and day, i took the rubber off the mounts and now it runs smooth and i'm sure i'm getting at least another 5 mphs out of it. it still has a very small spot on the rpm range where it vibrates a little bit,but it smooths out when i speed up over that i think that just has to do with the fact that this engine still isn't fully broken in.all that vibrating had caused my intake bolts to loosen up and almost fell off on my way home today. i managed to hold the one nut on and ride it up the hill to get home, then i put some new nuts and lock-washers on it and i'm back in biz. thanks a bunch guys that totally solved my vibration problems now i'm riding in style.