WSM Piston Kit - Honda 350 - +.25 mm 50-226-04K

Stock pistons are a compromise between cost and performance—they generate excessive heat, suffer friction losses, and wear faster under racing conditions. The WSM Piston Kit replaces these limitations with precision-engineered forgings that dissipate heat more effectively, reduce parasitic friction, and deliver measurable power gains while extending engine life. Built to OEM or higher standards, these pistons are engineered for serious builders who demand reliability without sacrifice.

Each kit includes everything needed for one cylinder, and the improved E-clip design ensures secure retention under high RPM loads. The proprietary MOS2 coating on the skirts actively draws heat through the piston walls and out the bottom, keeping ring grooves cooler and stronger. Specially hardened ring lands resist deformation from repeated compression cycles, making this kit ideal for naturally aspirated and forced-induction applications alike.

• Oversized: +.25 mm
• Engine: Honda 350
• MPN: 5022604K
• Includes: Piston, rings, pin, clips
• Material: Premium forged
• Skirt coating: MOS2
• Coating benefit: Heat dissipation
• Ring lands: Hardened steel
• E-clip: Improved design
• Installation: Bolt-on replacement
• Additional rings: Available separately
• Order quantity: One per cylinder
• Standard: Meets/exceeds OEM