shouldn't be smacking the rev limiter like that on a korean made motorcycle. Thier quality of materials used is uh... lacking... to say the least.

That being said, since you were at high rpm when it happened, I'd be willing to bet you have some valve float, valve(s) hit pistons, and you bent a valve slightly.

Not saying that's it 100%, just an educated guess. I have plenty of experience with valve float:

this is what happens with severe cases (my 750 motor from my old 'fighter)

the only thing holding the 2 halves of the piston together is the rings and the wrist pin




check out the bend in the rod