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Message: [QUOTE="AV8R, post: 1311809, member: 66464"] I tend to agree with whenfoxforks in that it was likely a piston worn beyond limits and failed due to piston slap. To solve my detonation problem I retarded the timing, milled the head to get a .050" squishband and jetting. Poor cooling can also contribute to detonation. Getting the squishband set properly is the secret on these bikes. If you are at a low altitude you will need to get the head space enlarged/adjusted as well to avoid too high of a compression ratio. [/QUOTE]