Wiseco PK1176 Pro-Lite Top End Piston Kit Bore - 2-Stroke 56.0mm

The Wiseco PK1176 is a Pro-Lite forged 2-stroke top end piston kit designed for the 1998–2000 Yamaha YZ125, featuring a 56.0mm overbore diameter (2.00mm oversize). Built on Wiseco's decades of 2-stroke piston manufacturing expertise, the Pro-Lite line delivers a proven combination of strength, reliability, and performance for all-purpose 2-stroke riding and competitive racing.

Kit Includes:

• Forged Pro-Lite piston — 56.0mm bore diameter (726M designation)
• High-quality piston ring set
• High-strength alloy wrist pin
• Circlips (c-clips)
• Top end gasket set

Key Features:

• USA forged and machined — engineered and manufactured in-house at Wiseco's Mentor, Ohio facility
• Forged construction delivers superior tensile strength, improved grain structure, and greater resistance to impact and fatigue compared to cast OEM pistons
• Dedicated piston forging with optimized strength-to-weight ratio for the YZ125 engine
• Race-ready dome design with smooth edges for improved combustion flow
• Precision-machined tolerances for quiet running and optimized fitment
• Designed for 2.00mm overbore applications — ideal for cylinder rebuilds or overboring

The Wiseco Pro-Lite piston kit provides everything needed to complete a top end rebuild in one convenient package. Trusted by top race teams across Supercross, Motocross, and GNCC, the Pro-Lite series is the benchmark forged 2-stroke piston for riders who demand durability and consistent performance.