Severe vibrations

New install. Is it normal for you hands and BUTT to be numb after a ride this sucks, and good ideas to modify the vibrations???? PLEASE!!!!!!!!!!!!!!!!!!!!!

Some frames and some kits seem to vibrate more then others. Sometimes with time it gets better.

motorized bicycle vibration

bicycle motor vibration

Also balancing your wheels might help

Motorized bicycle wheel balancing

motor bicycle Wheel balancing

They smooth out with miles. A few hundred should do it.

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If it ain't broke, and you mess with it long enough, it will be.

On my particular build, the greatest vibration came from the chain. If you were to take the slack out of your chain (best to remove it altogether) and you were to take the individual links and squeeze them to go through their full range of motion...something like this: __^__
If you can't freely fold the links, voila! Just maintain the shape indicated above and give a good hard side-to-side force...to exert the sideways force to the links that are stuck..should free them up nicely.

I agree- most of the vibration from the bikes I've built (after break in) comes from the chain.

Just don't make it too tight or your tensioner will make severe vibrations on your spokes.

3/4" will do it.

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If it ain't broke, and you mess with it long enough, it will be.

Out of curiousity, to verify the chain vibration, get to good speed and kill the engine/pull in the clutch. It should be smooth and quiet. If not...chain needs fiddling with.