yea we had to have devans (my friend) rebored because the last time it was bored out they made it egg shaped and that sucked. ok so we get it rebored, and the piston chips inside of the bore, so then we tear down the whole bike and start all over agian with a new piston and a new bore (just in case) it was a pain in the ass. thats why i vowed to never ever ride a 2 stroke agian. lol