Wiseco 679M05700 Pro-Lite Forged Piston Kit Yamaha - 2-Stroke 57.00mm TZR125

The Wiseco 679M05700 is a Pro-Lite forged piston kit designed for the Yamaha TZR125 (1987–1992) and compatible 125cc 2-stroke applications. Engineered for high-performance engines, this kit features a 57.00mm bore diameter, making it an oversize replacement that requires cylinder boring or sleeving prior to installation.

Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, standing up to the abuse that high-performance motorsport applications require. Forgings have condensed grain aligned to the features of the part, producing higher mechanical properties and resistance to impact and fatigue — with each forging designed to optimize the strength-to-weight ratio and maximize performance.

Key Features:

• Forged construction: Engineered, forged, and machined in the USA in Mentor, OH
• Optimized design: Designed and built for each specific 2-stroke powersports engine with improved tensile strength to optimize strength and service life
• Lightweight strength: Dedicated forgings and additional lightening operations allow for an optimized strength-to-weight ratio
• Complete kit: Includes high-quality piston ring(s), wrist pin(s), and circlips
• Bore diameter: 57.00mm (1.00mm oversize)
• Displacement: 127cc
• Series: Pro-Lite (Classic Forged) 2-Stroke

Wiseco's legacy is rooted in 2-stroke piston manufacturing dating back to 1941. Today, Wiseco 2-stroke pistons are the result of decades of experience, incorporating the latest in design and manufacturing to deliver proven performance. In-house dyno testing gives Wiseco the ability to develop state-of-the-art technology such as new shapes, coatings, and components.

Note: This is an oversize piston (57.00mm). Cylinder boring is required before installation. OEM cross-reference numbers include Yamaha 3MB-11631-02-95, 3MB-11631-00-00, 3MB-11631-01-00, and 4FL-11603-00.