03 mxz 800 road 3 times ..maybe put 60 miles on it .went out night riding for about a hour she stared running rough. Still had power but coughing and sputtering.... anyways got it to my truck under it's own power loaded it and went home. Next day after work i fired it up 3 pulls and road it in the shop..first thing I pulled the plugs and immediately found one plug belt side was all pitted and bent over obvious blown piston... question is why 0ne score mark on the cylinder wall on the carb side. Bottom end freshly rebuilt with ome parts maybe 500 miles on it ..
Never seen one this bad
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