Wiseco 520M04900 49mm 2-Stroke Forged Piston Kit for Yamaha YZ80

The Wiseco 520M04900 is a high-performance 49.00mm forged piston kit designed for 2-stroke off-road applications, specifically compatible with the Yamaha YZ80 (1985–1987). Engineered for demanding motocross and off-road riding conditions, this piston delivers exceptional durability and power output.

Key Features:

• Forged high-silicon aluminum alloy construction for superior strength, reduced weight, and long-term reliability over cast alternatives
• Innovative forging design and optimized piston skirt geometry maximize horsepower and torque throughout the RPM range
• Complete piston kit includes piston, rings, wrist pin, and circlips — everything needed for a full top-end rebuild
• 49.00mm bore diameter — an oversize piston requiring cylinder boring or sleeving for proper fitment
• Manufactured to tight tolerances for precise fit and optimal ring seal
• Wiseco part number 520M04900, also referenced as kit 1929CS

Wiseco has been a trusted name in high-performance forged pistons for powersports, motorsports, and racing applications for decades. The 520M04900 piston kit is an ideal choice for riders performing a top-end rebuild or upgrading to an oversize bore for added displacement and performance.