Wiseco PK1391 GP Series Top End Kit – 56mm – 2017-2022 Yamaha YZ125 / YZ125X

✨Wiseco PK1391 GP Series Big Bore Top End Kit – 56mm – 2017-2022 Yamaha YZ125 / YZ125X

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If your Yamaha is begging for more muscle, the Wiseco GP Series PK1391 Top End Kit 56.00 mm is the secret weapon your 2-stroke has been waiting for. Built for riders who never roll off the throttle, this YZ125 GP Series top end piston kit 56mm unleashes longer-lasting power, harder hits, and that razor-sharp throttle response every blue-crew addict loves. Wiseco packed this kit with performance coatings, competition-ready forging, and USA-made quality that keeps your motor happy at high RPM—exactly what a YZ125 GP Series top end piston kit 56mm should do.

Whether you’re running moto after moto, shredding woods races, or stacking hours like a trail maniac, this YZ125 GP Series top end piston kit 56mm is engineered to survive punishment. With Electra-Coating to fight heat, ArmorGlide to kill friction, and featherweight machining for instant snap, this GP Series top end is built to stay strong when the revs stay high. More durability, more power, more fun—Wiseco knows exactly how to make your YZ bark.

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✅ Fitment List

Yamaha

• YZ125: 2017–2022
• YZ125X: 2020–2022

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➡️ Top Features

• Built for endurance & sustained-RPM 2-stroke performance
• Forged, engineered & machined in the USA (Mentor, Ohio)
• Electra-Coated crown, ring grooves & pin bores for heat resistance
• ArmorGlide skirt coating reduces friction and boosts power
• Featherweight machining for quicker throttle response
• Includes rings, wrist pin & circlips—everything for a true top-end refresh
• GP Series durability for both competition & all-day play riders

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➡️ FAQ

Q: What makes the GP Series different from regular Wiseco pistons?
A: GP Series adds Electra-Coating, ArmorGlide skirts, and endurance-ready features for high-RPM and long-hour riding.

Q: Does this kit come with everything needed for a top-end rebuild?
A: Yes—piston, rings, pin, circlips, and all high-quality components needed for installation.

Q: Is the 56.00 mm bore compatible with stock cylinders?
A: Yes, it fits YZ125/YZ125X cylinders designed for the 56.00 mm factory bore.

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🚀 Level up your Yamaha’s power, durability, and throttle-happy attitude—grab your Wiseco GP Series PK1391 kit today and keep your 2-stroke screaming for more!

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