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Namura Technologies NA-50011-6K Top End Repair Kit - 1.50mm Oversize to 98.07mm fuel-air-fuel-pumps 2011-2013 Ski-Doo MX Z X-RSBore: 98. 07mm Sizing: 1. 50mm Oversize Top End kit includes: piston, rings, wrist pin, clips, top end bearing, and gasket kit. MOS2 (Teflon Molybdenum) Coated Skirts A rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures. Machined Smooth Heads Reflects combustion heat and reduces carbon buildup, protecting