does anybody else have a bad vibration in the rear? end try holding the tires off the ground giving it gas and letting off, bad vibration maybe bad bearings done it since new

 

i saw your posting last week finally got around to testing ours, our 70cc sunl is smooth, doesn't seen to vibtate at all, the sunl 90 is a vibrator, i don't thinks it's a bad bearing because the axle don't wobble or have play in them, what it appears to be is everything is out of balance, the wheels and the tires and everything else, doesn't seen to vibrate when running it, so i don't really think we can do much about it.

 

i got down and really checked it out this morning the vibration is cause by the chain.