Wiseco Pistons 797M05500 Pro-Lite Forged Piston Kit Yamaha - 2-Stroke 55mm YZ125

The Wiseco 797M05500 Pro-Lite piston kit is a high-performance forged 2-stroke piston assembly designed specifically for 2002-2004 Yamaha YZ125 liquid-cooled engines with a 55.00mm bore diameter. This complete piston kit represents 1.00mm oversize from the standard bore specification.

Wiseco Pro-Lite Technology:

• Forged from aerospace-grade aluminum alloy for superior strength-to-weight ratio
• Innovative forging design and piston skirt profile for maximum horsepower and torque
• Computer-engineered skirt profiles minimize cylinder wall friction
• Lightweight construction enables faster engine revs and quicker throttle response
• Designed for improved durability, longevity, and increased horsepower

Complete Kit Includes:

• Forged Pro-Lite piston (55.00mm bore)
• Piston ring set
• Wrist pin (S467)
• Two circlips (CW15)

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons strictly using the forging process, ensuring superior impact resistance, fatigue resistance, and enhanced material properties. Each Pro-Lite piston is precision-machined to exact tolerances for optimal performance in both racing and recreational riding applications.

Note: Top-end bearing (B1001) available separately. Only Wiseco replacement ring sets can be used on Wiseco pistons. This piston is sold by bore size - verify your engine's required bore size before ordering to ensure proper fitment.