Check to make sure your motor mount bolts are properly tightened (don't overtighten and snap them off) There should be 2 in the front and one in the back at the bottom. Also check your front and rear wheel s to make sure they are properly seated and secured.
Check your tranny to make sure you have 9.5 ounces of ATF Type "F" fuild in the tranny and don't overfill it. Best to get some new ATF, drain the old (plug underneath) and refill.
Could be chain slap, use rear wheel tensioners to tighten chain slack if needed. You should be able to push down on the drive chain at least 1/8" (left side of bike)
Check these things first before you ride it again!