PIston failure diagnosis?

lundi 26 février 2018

Rebuilding top end on 2008 RMK 600. Before I put this back together I want to be sure I’ve addressed any issues that caused the failure.

On the mag side it looks like pieces of the piston broke off and rattled around in the cylinder. My ideas what could have caused this?

On the pto side there is grooving on the back side of the piston but jug looks fine. What would cause this?

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PIston failure diagnosis?

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