Wiseco SK1334 Snowmobile Top End Piston Kit 74mm 10:1 Compression Turbo

The Wiseco SK1334 is a complete forged top end piston kit engineered specifically for turbocharged Yamaha RX1, Apex, Attak, and RX Warrior snowmobiles. Running a 10.0:1 compression ratio and 74.00mm bore diameter, this kit is purpose-built for forced induction applications where lower compression keeps cylinder pressures and heat in check under boost.

Wiseco forges all of its pistons in-house in the USA, starting with aerospace-grade aluminum. The forging process aligns the grain structure of the alloy, producing a piston with superior impact resistance, fatigue strength, and ductility compared to cast alternatives. Each piston is engineered using 3D design techniques and finite element modeling to optimize the strength-to-weight ratio for the specific demands of high-output snowmobile engines.

Kit Contents:

• 4x Forged aluminum pistons (Wiseco P/N 4808M07400)
• Piston rings for each piston
• Piston pins (wrist pins)
• Circlips
• Top end cylinder head gasket

Key Specifications:

• Bore Diameter: 74.00mm (standard bore)
• Compression Ratio: 10.0:1 (turbo-optimized)
• Construction: Forged aluminum — USA manufactured
• Individual Piston Part Number: 4808M07400

Wiseco's in-house dyno testing and field-testing network ensure each kit meets the rigorous demands of high-performance snowmobile use. This kit is the ideal foundation for a turbo top end rebuild, delivering the durability and consistency required for forced induction power levels.