WSM Piston Kit - Polaris 300 - +.50 mm 50-310-05PK

When you're pushing your Polaris 300 to its limits, factory pistons are your weak link. The WSM Piston Kit delivers OEM-matching quality with tangible performance upgrades—specifically engineered MOS2 coatings that reduce friction, dissipate heat more efficiently, and extend ring life under sustained high RPM operation. If you're serious about reliability and extracting additional power from your engine, this is the oversize option that delivers measurable results.

This kit contains everything needed for one cylinder, with specially hardened ring grooves that withstand aggressive combustion pressures. The improved E-clip design ensures secure piston pin retention, while the nonabrasive MOS2 coating on the skirts actively draws heat away from critical areas—keeping temperatures lower and power delivery more consistent across the powerband.

• +.50 mm oversize
• MOS2-coated skirts
• Hardened ring grooves
• Improved E-clip design
• Includes piston, rings, pin, clips
• One kit per cylinder
• Meets/exceeds OEM specs
• Additional rings available separately
• MPN: 50-310-05PK