Wiseco 40071M05400 Forged Piston Kit Compression - 54mm 13 1

The Wiseco 40071M05400 is a high-performance forged piston kit designed for the Yamaha Raptor 125 ATV (2011–2013). Featuring a 54.00mm standard bore and an aggressive 13:1 compression ratio, this kit is built for riders who demand more power and reliability from their ATV engine.

Key Features:

• Forged high-silicon aluminum alloy construction for superior strength-to-weight ratio and long service life
• 13:1 compression ratio delivers increased horsepower and torque over stock
• 54.00mm standard bore diameter for a precise, OEM-compatible fit
• Race-ready dome finish with smooth edges for improved combustion chamber flow
• Horizontal slot-pin oiling reduces friction and provides scuff resistance with a pressure seal groove for maximum ring seal
• Armor Glide skirt coating reduces friction and noise while contributing to increased horsepower
• Dedicated aerospace-grade alloy forgings precision machined in the USA
• Complete kit includes: forged piston, ring set, wrist pin, and circlips

Wiseco piston kits are trusted by top race teams across Supercross, Motocross, GNCC, and more. Each kit is engineered to deliver a direct, drop-in fit for standard bore applications. Note: Oversize pistons require cylinder re-sleeving or boring to the appropriate diameter.