WSM Piston Kit - Polaris 300 - Standard 50-310PK

Stock pistons wear quickly under racing conditions, leading to lost compression and power. The WSM Piston Kit for Polaris 300 delivers OEM-equivalent quality with engineered improvements—including an advanced E-clip design and MOS2-coated skirts that actively dissipate heat and reduce friction. Whether you're rebuilding after a season or upgrading preventatively, this kit restores reliability and adds measurable performance gains.

Each kit contains everything needed for one cylinder and meets or exceeds original equipment specifications. The MOS2 coating on the piston skirts is the standout feature here: it reduces heat generation by drawing thermal energy through the piston walls and out the bottom, lowering operating temperature while minimizing friction-related wear. Combined with specially hardened ring groove tops for added durability, you get a piston that performs harder and lasts longer.

• Fits: Polaris 300
• One kit per cylinder
• Includes piston, rings, pin, clips
• OEM-equivalent quality
• Advanced E-clip design
• MOS2-coated skirts
• Reduces heat, friction
• Hardened ring groove tops
• Additional rings available separately
• Bolt-on installation
• MPN: 50310PK