My 2001 has, I'd guess between 200 and 300 hours on the motor. I've adjusted the valves once, they were just slightly tight. Recently I've been thinking I should probably change out piston/rings/gaskets. But the bike doesn't burn oil, and I still need the compression release to start it. But sometimes I think its down on power compared to when it was new. What have others done? Wait for smoke, or do a leak-down test? About the only thing I've noticed is that with the motor off, if I rest my foot on the kickstarter, it seems to fall through quicker than before. Thanks for any help..