Hey,
I have a 89 cane and it works real good except for a strange bumping feeling Im getting while riding 31 mph to about 75 mph after that speed the feeling stops.

I replaced my front sprocket with a -1 sprocket and chain late last year and didnt replace the rear one. (iI know you should replace both) I also checked the chain for a STUCK LINK BUT EVERYTHING LOOKED GOOD

After riding a short time a thumping developed that i could feel in my foot pegs. So last right I replaced the rear sprocket and It seemed to go away. Untill riding into work this morning it started again?

 

Are your tires worn or imbalanced? More info.

 

tires are in good shape. rim isnt damaged and the wheel weights that were put on when the tire was changed are still there.

It happens with the clutch in or out. feels like some ones under my pegs tapping them with a hammer

 

is your chain tightened properly? is on acceleration or deceleration?

 

Yea I have adjusted the chain many times but it still happpens. It occurs when the durring acceleration and deceleration. while the clutch in and out