WSM Piston Kit - Polaris 300 - +.50 mm 50-310-05PK Heatshields Internal lining includes anti-slide microfiber

Internal lining includes anti-slide microfiber suede on the heel to help keep foot in position

2021-2023 Yamaha YZ 250 FX - - 2019-2023 Yamaha YZ 450 FX - - 2019-2023 Yamaha YZ 250 F - - 2018-2022 Yamaha YZ 450 F

increased power transfer and lower operating belt temperature

Stretch rib fabric on collar

WSM Piston Kit - Polaris 300 - +.50 mm 50-310-05PK Heatshields Internal lining includes anti-slide microfiberQuality and construction that meets or exceeds OEM Feature improved E clip design Contain piston, rings, pin and clips Additional rings available separately Order one per cylinder Skirts have a nonabrasive, expansion retarding MOS2 coating to reduce heat and friction for added power and longevity MOS2 coating actually draws heat through piston walls and out the bottom Specially hardened tops add strength to ring grooves