This is what happens when the YZ250 sucks in lots of dirt. The piston takes the brunt of whatever abuse is thrown at it. @la144 got the engine vapor blasted before we Pivot Piston Titanium Top The Wym Shop Vapor Blasting the World's Smallest Piston Vapor Honing Technologies PFC Replacement Piston Cap Kit 44.0mm 2 pcs Parts of the Piston Explained Simply!
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