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  1. #1

    Gpr1200 piston fail

    Does this look like a lean mixture may have caused this or possibly detonation? My gpr has [email protected] heads, riva f/a's, riva free flow exhaust. I'm leaning more towards detonation as i ran std pump fuel. I'm looking for some advice as there is not much help around my area. This pic is #1 0 compression #2 looks similar but holding 150psi #3 looks new (as it should) 155psi
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  2. #2
    mudslanger's Avatar
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    According to piston wash it looks lean and the way the piston is burnt away on the exhaust suggest detonation.

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