Wiseco SK1367 ProLite Snowmobile Piston Kit Standard Bore 79.00mm 9.5:1 Yamaha

The Wiseco SK1367 ProLite Piston Kit is a complete top-end rebuild solution engineered for Yamaha snowmobiles, featuring a standard 79.00mm bore and 9.5:1 compression ratio. Designed specifically to meet the demands of snocross and cross-country racing, this kit delivers the strength, durability, and precision fit that high-performance snowmobile engines require.

Why Forged Over Cast?

Wiseco pistons are manufactured exclusively using the forging process—the only major U.S. aftermarket piston brand to do so. Starting with aerospace-grade aluminum, forging compresses the material's molecules, aligns the grain structure, and produces a piston with superior mechanical properties compared to cast alternatives. Cast pistons are inherently brittle with no grain structure and tend to fail catastrophically under stress. Wiseco forgings resist impact, fatigue, and the extreme thermal loads common in high-output snowmobile engines.

Key Features:

• Standard 79.00mm bore with 9.5:1 compression ratio
• Pro-Lite forged piston — CNC machined for optimal cam shape and profile for peak horsepower and service life
• Engineered, forged, and machined in the USA at Wiseco's Mentor, OH facility
• In-house forge tooling production ensures tight tolerances from raw material to finished part
• Skirt coating applied for reduced friction and improved scuff resistance
• Optimized strength-to-weight ratio for maximum performance without unnecessary mass
• Developed and validated using Wiseco's in-house dyno testing program

Complete Kit Includes:

• Forged Pro-Lite piston(s)
• Piston ring(s)
• Wrist pin(s)
• Circlips
• Top-end gasket kit

All components are specifically selected by Wiseco to complement their forged pistons, making this a true one-stop top-end rebuild solution. Whether you're restoring a worn engine or preparing for your next race season, the SK1367 delivers proven Wiseco reliability.