Wiseco Piston Kit 54mm for Yamaha YZ125 2005-2021 PK1571

When you're pushing a YZ125 to its limits on the track or trail, your piston kit needs to handle extreme combustion pressures and temperature swings without compromise. Wiseco's forged-from-bar-stock construction delivers the strength and thermal stability that 2-stroke engines demand, while their complete top-end package eliminates the guesswork of sourcing compatible components. This is the kit serious racers and rebuild shops trust when durability and performance can't be separated.

The PK1571 includes everything needed for a full top-end refresh: high-silicone forged pistons, precision-engineered rings, wrist pins, circlips, and complete gasket set—all engineered as an integrated system. The forged construction resists thermal expansion better than cast alternatives, reducing ring blow-by and maintaining consistent compression across heat cycles. Fitment is vehicle-specific to the Yamaha YZ125 (2005–2021), ensuring zero clearance issues.

Important: Wiseco rings are designed exclusively for Wiseco pistons and are not interchangeable with other manufacturers. Always use the complete kit together for optimal reliability.

• 54mm bore diameter
• Forged high-silicone construction
• Yamaha YZ125 compatible
• 2005–2021 model years
• Includes pistons, rings, pins
• Circlips and gaskets included
• Complete top-end kit
• Wiseco rings only
• Bolt-on installation
• Professional-grade durability