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Engines and Components Pistons and Piston Rings

Wiseco

Wiseco Yamaha YZ125 05-20 GP Series(846M05600) Piston

$258.95 $232.99 Save $25.96

SKU: W00C PK1391

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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Part #: PK1391

Wiseco's GP Series forged 2-stroke pistons build on the tried-and-true base of the Pro-Lite. Wiseco GP Series 2-stroke pistons incorporate additional performance and durability enhancing features including an Electra-Coated crown, ring groove(s), and pin bores plus ArmorGlide skirt coating, making them perfect for endurance and sustained-RPM 2-stroke applications. From play riders putting in hard hours to consistent competition, GP Series 2-stroke pistons are up to the challenge.

Features:

  • Designed for endurance and sustained-RPM 2-stroke riding
  • Engineered, forged, and machined in the USA in Mentor, OH
  • Designed with optimized features for long service life and top-end power
  • Electra-Coated crown, ring groove and pin bore resists potential wear, combustion heat damages, and ring micro-welding
  • ArmorGlife skirt coating reduces friction to optimize performance potential
  • Extra lightening operations for enhanced throttle response
  • High-quality ring(s), wrist pin(s), and circlips included

Wiseco 2 Stroke GP Series Piston Kit, 56.00 mm Bore

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

MIA's Description

The Wiseco PK1391 GP Series Top End Kit is a premium piston kit with gaskets, designed for optimal performance and durability in Yamaha YZ125 and YZ125X two-stroke engines. Crafted from 4032 aluminum alloy, this kit features an Electra-Coated crown and ArmorGlide® skirt coating for maximum wear resistance and protection against micro-welding, galling, and detonation.

Engineered, forged, and machined in the USA, this kit promotes enhanced throttle response and acceleration through extra lightening operations. It provides the quality and performance necessary for endurance and sustained high RPM riding, whether for racing or recreational use.

Fitment

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Specifications

BrandWiseco
Part NumberW00C PK1391

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Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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