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Couple of things to check right off the bat.
1. Check the chain tension. If the chain doesn't have enough slack in it, it will cause extra vibrations.
2. Rear wheel alignment. Make sure that the distance from the swing arm pivot point and the rear axle is the same on both sides. If it is off, the chain will ride up on the sprocket a bit and cause a vibration.
3. Check every link of the chain, particularly the master link. Sometimes when the master link is riveted together, it is done too tightly and that link of the chain doesn't articulate as well as the others. This causes the chain to stay in a wrapped position as it comes off the countershaft (front) sprocket. This causes a vibration in the chain as that link finally releases from the countershaft sprocket.
Good luck getting it sorted...
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