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Increase cooling capacity for lower running temps which helps maintain peak powerLow altitude gains 4-5 mid range horsepower and 2-3 peakHigh altitude riders gain 6-7hp in the mid range, and 4-5 peak Polaris -- Rush 800 Pro-S LE 1.35" w/120" Track --...

All piston kits come with two pistons, rings, wrist pins, and wrist pin keepersCompression ratios listed are approximate and are calculated using the correct length cylinders as specified by S&SRequire the use of connecting rods with a rod length of 7...

These forged 3-7/8" bore stroker pistons for 1999-'16 HD® Big Twin are required for the S&S 106" stock bore stroker kit with 4-1/2" stroke flywheelsThey are compatible with stock or S&S® Super Stock® cylinder headsStock 88" cylinders may be bored to...

These forged 3-7/8" bore stroker pistons for 1999-'16 HD? Big Twin are required for the S&S 106" stock bore stroker kit with 4-1/2" stroke flywheelsThey are compatible with stock or S&S? Super Stock? cylinder headsStock 88" cylinders may be bored to...

These forged 3-7/8" bore stroker pistons for 1999-'16 HD? Big Twin are required for the S&S 106" stock bore stroker kit with 4-1/2" stroke flywheelsThey are compatible with stock or S&S? Super Stock? cylinder headsStock 88" cylinders may be bored to...

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylindersCylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel Silicon Carbide plated for long...

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylindersCylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel Silicon Carbide plated for long...

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylindersCylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel Silicon Carbide plated for long...

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylindersCylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel silicon carbide-plated for long...

Ready-to-install, direct bolt-on cylinder requires no re-plating and looks virtually identical to the OEM cylindersNickel silicon carbide-plated for long lifeMade in the U.S.A. Polaris -- RZR XP 1000 4x4 -- (2017, 2018, 2015, 2014, 2016); Polaris -- RZR...

Ready-to-install, direct bolt-on cylinder requires no re-plating and looks virtually identical to the OEM cylindersNickel silicon carbide-plated for long lifeMade in the U.S.A. Polaris -- RZR Trail 900 EPS 4x4 -- (2015, 2016); Polaris -- RZR 900 XC 4x4...

Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylindersCylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel Silicon Carbide plated for long...