Wiseco 236M05750 Forged Piston Kit Oversize - 57.50mm 1.5mm YT125

The Wiseco 236M05750 is a +1.5mm (.060") oversize forged piston kit with a 57.50mm bore diameter, engineered for Yamaha 125cc two-stroke engines. Built entirely in the USA, this kit delivers the durability and precision demanded by both recreational riders and performance enthusiasts.

Kit Includes:

• 1 Forged piston
• 1 Piston ring set
• 1 Wrist pin
• 2 Wrist pin circlips

Key Features:

• USA Forged Construction: Manufactured from high-silicon, low-expansion aluminum alloy using an in-house forging process — the only aftermarket piston brand in the US to forge all pistons on-site. Condensed grain structure aligned to part geometry delivers superior strength, impact resistance, and fatigue life compared to cast alternatives.
• Diamond-Turned Finish: CNC-machined to exact tolerances on computer-controlled turning centers, ensuring a consistent finish with no size variation for confident installation into cast iron, chrome, Nikasil, and boron composite cylinder bores.
• Optimized Strength-to-Weight Ratio: Each forging is designed using 3D modeling and finite element analysis to minimize weight while maximizing structural performance under high-stress operating conditions.
• Oversize Rebuild Solution: The .060" oversize is ideal for restoring worn cast iron lined cylinders to factory tolerances. Compatible cylinder sleeves are also available to allow resleeving of chrome, Nikasil, and boron composite cylinders to accept this oversize piston.
• Complete Kit: Includes piston, ring set, wrist pin, and circlips — everything needed for a single-cylinder rebuild in one package.

Wiseco part number 236M05750 uses the 2264CD piston design. Compatible with a broad range of Yamaha 125cc two-stroke applications including the AT2, AT3, DT125, IT125, MX125, and YT125 Tri Moto models.