Top End

Replaces the OEM valves and valve springsSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra weight of the steel valvesSprings are made from premium chrome vanadium steel for...

Prox Piston Kit - 82.00 Mm - 850 Etec Engine - Ski-Doo 01.5817.000 Ski-Doo -- Summit 850 SP 2.5" E-TEC w/154" Track -- (2017, 2019, 2020, 2018, 2021, 2022); Ski-Doo -- Freeride 850R 3.0 E-TEC w/154" Track -- (2018, 2021); Ski-Doo -- Freeride 850R 2.50...

Prox Piston Kit - 85.00 Mm - Polaris 01.5819.000 Polaris -- Rush 850 Pro-S 1.25" w/120" Track -- (2020, 2019); Polaris -- Rush 850 XCR 1.75" w/121" Track -- (2019); Polaris -- Rush 850 Pro-S 1.35" w/120" Track -- (2020); Polaris -- Pro-RMK 850 3" w/174"...

Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston lifeCoated skirts ease break-in, decreasing wear and aiding in lubricationWear-resistant piston ringsWrist pins...

All pistons are heat treated with a T-5 hardening and tempering cycleAll piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeCast piston kits are gravity cast aluminum alloy (not...

Prox Piston Kit - 92.94 Mm - Yamaha Wolverine Rmax2/Rmax4 01.2921.A Yamaha -- Wolverine Rmax4 1000 -- (2021); Yamaha -- Wolverine Rmax2 1000 Limited Edition -- (2021); Yamaha -- Wolverine Rmax4 1000 XT-R -- (2021); Yamaha -- Wolverine Rmax4 1000 Limited...

Prox Piston Kit - 66.34 Mm - Sherco 250Se/250Se-R 01.7334.A Sherco -- 250 SE-R -- (2014, 2016, 2015); Sherco -- 250 SE -- (2015, 2014); Sherco -- 250 SE-R Factory -- (2015, 2014, 2016)

• Most Wiseco 2-stroke pistons are forged from high-silicone bar stock • Greater strength and lower expansion at high temperatures • All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips • Wiseco ring types are not...

Prox Piston Kit - 66.34 Mm - Sherco 250Se/250Se-R 01.7337.A Sherco -- 250 SE-R -- (2020, 2018, 2019, 2017, 2024); Sherco -- 250 SE-R Factory -- (2017, 2020, 2021, 2019, 2018); Sherco -- 250 SE Racing -- (2021, 2020, 2022); Sherco -- 250 SE Factory --...

Prox Piston Kit - 66.34 Mm - Beta Rr250/Xtrainer 250 01.7313.A Beta -- 250 RR 2T -- (2018, 2021, 2019, 2014, 2015, 2017, 2020, 2013, 2016); Beta -- X-Trainer 250 -- (2018, 2019)

Prox Piston Kit - 66.34 Mm - Gas Gas Ec250/Mc250/Xc250 01.7307.B Gas Gas -- EC 250 Six Days -- (2019); Gas Gas -- MC 250 -- (2008, 1998, 1999, 2007, 2005, 2003, 2004, 2002, 2009, 2006, 1997, 2000, 2001); Gas Gas -- MC 250 Ohlins -- (2005, 2007, 2008,...

WISECO PISTON POL 1MMHIGH-PERFORMANCE PISTONSForged from high-silicon aluminum alloy for maximum strength and dependabilityWiseco offers a complete range of popular piston models and years for both trail and racing applicationsWISECO FEATURES PRO-LITE...