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Parts and Accessories

How Wiseco Developed a New YZ125 2-Stroke Piston

All 2022 YZ125 piston kits include
high-quality piston ring, high-strength wrist pin, and circlips.


A long-awaited update to the beloved 125cc premix-burner from Yamaha finally came to two-stroke lovers with the 2022 YZ125, so what does that mean for us? Well, if you’re riding a 125 like it should be (wide open), chances are you’ll need to do a top end sooner rather than later. 

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A nod to 80-plus years of two-stroke experience, Wiseco doesn’t want to just copy an original equipment manufacturer (OEM) part and call it a day. Wiseco documented the key development stages of its new, 2022 YZ125 piston design in the three major steps: engineering, testing (thanks to @Dirt Bike TV) and development. The final result is a range of forged pistons for the 2022 YZ125 to fit any riding or racing level.

As with all Wiseco pistons, the 2022 YZ125 piston line is proudly engineered, developed, forged and machined in-house in Wiseco’s Ohio facility.

899M05600: Available Now

  • Drop-in, forged replacement offering greater strength-to-weight over OEM with additional measures for improved service life, including forced wrist pin and small-end oiling and ArmorGlide, low-friction skirt coating. Also offered in +2-millimeter overbore for higher displacement builds.

GP Series (900M05400): Available as soon as September

  • Same forged material, oiling and skirt coating as ProLite with additional lightening, offering an approximate 7-gram weight savings over OEM for quicker revving and throttle response.
  • Proprietary ArmorX coating provides highly protective thermal barrier in critical areas reducing heat-induced damage, wear and ring microwelding.

Racer Elite (RE931M05400): Available as soon as September

  • Forged from 2000-series alloy for maximized strength-to-weight ratio, ideal for high load racing applications
  • Same thermal protection and oiling benefits as GP Series piston
  • ArmorFit skirt coating conforms to cylinder for optimized clearance and reduced friction and wear, critical in demanding race conditions.

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