can the sleeve inside a '2003 yz450f cylinder be bored out to accept larger diameter pistons? or do these cylinders have the nikasil stuff on them? the new top-end i put in on friday failed on me todya. the circlip failed on one side and the wrist pin slid over and dug a nice groove into the cylinder sleeve. just wondering if i can take it to a local engine shop and have them bore it out and hone it for me so i can just drop a new piston in there..