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Namura Technologies FX-10039-B Piston Kit - 0.01mm Oversized to 76.81mm, 13.2:1 Compression engine-power-up-kits 2013 Yamaha YFM700 Grizzly FIBore: 76. 81mm Compression: 13. 2: 1 Compression Sizing: 0. 01mm Oversize 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 the top of the piston. Some tests have shown this