So I swapped a Predator 212 onto a Baja Dirtbug and it runs great. Used an engine mounting plate and it fits very tight but fits and works. But the engine shakes so bad at 1/4 - 1/2 throttle. It shakes so bad that it throws the chain. Any idea why this could be? I read that it could be because of the engine being brand new and it needs to just break in. Any truth to that? Thanks for the help friends!