Wiseco 4795M09450 4-Stroke Forged Piston Kit 94.50mm Bore 440cc Big Bore 12.5:1 Compression

The Wiseco 4795M09450 is a 4-Stroke Forged Series Piston Kit engineered for ATV big bore applications. Featuring a 94.50mm bore diameter (4.50mm oversize), 440cc displacement, and a 12.5:1 compression ratio, this kit delivers the performance and reliability demanded by hard-riding ATV enthusiasts and racers alike.

Kit Includes:

• Forged aluminum piston
• Piston rings
• Wrist pin
• Circlips

Key Features:

• Forged in-house in the USA — Wiseco manufactures all forge tooling domestically, controlling every step from raw bar to finished part
• High-silicon, low-expansion aluminum alloy — provides superior strength, reduced weight, improved heat transfer, and extended service life
• Condensed, aligned grain structure — unlike brittle cast pistons, forged construction resists impact and fatigue, preventing catastrophic failure under high loads
• Optimized strength-to-weight ratio — each forging is designed to maximize performance without unnecessary mass
• ArmorGlide skirt coating — permanently bonded to the piston skirt for reduced friction and long-lasting wear resistance
• Diamond-turned finish — precision CNC machining ensures accurate sizing and smooth operation
• Big bore upgrade — 4.50mm oversize to 94.50mm; cylinder re-sleeving is required for installation

Wiseco has been the leading U.S. manufacturer of forged powersports pistons for over 80 years, supplying top-tier components for ATVs, dirt bikes, snowmobiles, and more. The 4795M09450 is a proven upgrade for riders seeking more displacement and higher compression from their ATV engine.