Wiseco 594M05700 Pro-Lite Piston Kit 57.00mm 1.00mm Oversize for YZ125

The Wiseco 594M05700 Pro-Lite Piston Kit is a 1.00mm oversize forged piston kit measuring 57.00mm bore, designed as a high-performance replacement for the Yamaha YZ125 (1990–1992). Built using Wiseco's proven Pro-Lite design, this piston delivers the strength, precision, and reliability demanded by both competitive motocross racers and recreational two-stroke enthusiasts.

Key Features:

• Forged high-silicon aluminum construction — provides superior tensile strength, reduced reciprocating weight, improved heat transfer, and longer service life compared to OEM cast pistons
• CNC diamond-turned finish — precision machined on computer-controlled turning centers for a perfect, consistent bore size with no variation
• Pro-Lite 2-stroke design — CNC machined for optimal cam shape and skirt profile, delivering peak horsepower and extended service life
• Antidetonation grooves and optimized ring land diameter — eliminates ring blow-by while maximizing engine performance
• Horizontal slot-pin oiling — reduces friction and provides scuff resistance, along with a pressure seal groove for maximum ring seal
• Compatible with all modern cylinder bore types — cast iron, chrome, Nikasil, and boron composite cylinders
• 1.00mm oversize (57.00mm) — extends the service life of worn cylinders; cast iron lined cylinders can be bored to accept this oversize
• Forged and machined in the USA — manufactured at Wiseco's state-of-the-art facility to the highest quality standards

Kit Includes:

• Forged Pro-Lite piston
• Piston ring (2244CS — 57.00mm)
• Wrist pin
• Circlips

Wiseco piston kits are engineered from decades of racing experience across Supercross, Motocross, and off-road competition. The 594M05700 is the ideal top-end rebuild solution for anyone seeking improved durability and performance from their two-stroke engine.