I just revved the @#$# out of my XT600 to "get the carbon out" and try leaner jetting to get a bit more top end power. Well, it started sputtering after this. I got home and found low compression. Just got the head off and my exhaust valves hit the piston. I just found one bent valve. Where the valves hit the piston, they aren't even close to the cutouts in the Wiseco piston so I'm wondering if they even gave the right F'n piston. Recommend a place I can get new valves? Do you think anything else should be changed? I may just leave the piston in. I don't want to put a lot of money into the old girl.