WSM Piston Kit - Polaris 500 - +1 mm 50-311-07K

When you're pushing a Polaris 500 to its limits, stock pistons become the weak link in your engine's performance chain. The WSM +1 mm piston kit delivers OEM-quality construction with engineered improvements—particularly the enhanced E-clip design and MOS2-coated skirts—that reduce friction, lower operating temperatures, and unlock measurable gains in power and reliability. Whether you're rebuilding after a hard season or upgrading for competition, this is the kit that doesn't compromise.

Each kit includes everything needed for one cylinder, so order one per cylinder in your build. The MOS2 coating on the piston skirts actively dissipates heat through the piston walls and out the bottom, while specially hardened ring groove tops resist the constant stress of combustion pressure. The result: longer piston life and consistent performance run after run.

• Fitment: Polaris 500 specific
• Oversized: +1 mm
• Includes: Piston, rings, pin, clips
• Construction: OEM-quality or better
• E-clip: Improved design
• Skirt coating: MOS2
• Coating benefit: Heat dissipation
• Ring grooves: Specially hardened
• Additional rings: Available separately
• Installation: Bolt-on replacement
• MPN: 50-311-07K