Wiseco Piston Kit Yamaha YZ 125 2005-2021 56mm 726M05500

When you're pushing your YZ 125 to its limits, factory pistons become the limiting factor. The Wiseco +1.00mm piston kit delivers the compression ratio and durability you need to extract reliable horsepower gains without sacrificing longevity—whether you're racing nationals or logging serious trail miles. This is a complete solution: forged piston, rings, wrist pins, and circlips work together as a precision system designed by engineers who understand high-RPM demands.

Built from high-silicon aluminum alloy and E-coated for wear resistance, this piston handles the thermal cycling and detonation pressures that stock components can't. The forged construction resists the flexing that leads to ring blow-by and power loss, while the optimized port design smooths out your powerband instead of creating erratic spikes. Whether you're chasing lap times or maximizing reliability in extreme conditions, this kit gives you the engineering advantage.

• Fitment: Yamaha YZ 125 (2005–2021)
• Size: 56mm, +1.00mm oversized
• Material: Forged high-silicon aluminum alloy
• Crown coating: E-Coated
• Ring grooves: E-Coated
• Includes: Piston, rings, wrist pins, circlips
• Installation: Requires professional rebuild
• Design: Boost ports removed
• MPN: 726M05500