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  1. What happened to my piston?!

    ATV Repair and Maintenance
    Hey guys. I bought a 2000 Scrambler 400 (2x4) and was told all it need was new rings. He told me it had been bored to an 85mm. When I took the top end off this is what i saw. The first picture is the front of the piston (the side facing exhaust) The top left of the piston has a chip in it...