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Message: [QUOTE="1999RM125RIDER, post: 1238570, member: 51687"] I have a 2003 RM250 that i am rebuilding the top end on, not because it blew up, just because i felt it was time. The bike was running fine when i took it apart. The top of the piston and the cylinder head have some tiny crater like pinholes and some burn marks and a local mechanic has told me I am having detonation problems. My question is: how do I cure this so that I don't blow up my new top end? I race but not in a pro or A class, so i am willing to sacrifice a small amount of performance to get reliability and long life. [/QUOTE]