Wiseco Pro-Lite Piston Kit with Gaskets - Yamaha YZ125 / YZ125X (2005-2022) - 56.00mm Bore (+2.00mm Big Bore) - 2-Stroke

Wiseco Pro-Lite Piston Kit with Gaskets - Yamaha YZ125 / YZ125X

Premium Wiseco Pro-Lite 2-stroke piston kit with complete top-end gasket set for the legendary Yamaha YZ125 and YZ125X. Everything you need for a professional top-end rebuild in one convenient package. This is a big bore kit that increases displacement to 134cc!

⚠️ Big Bore Kit: +2.00mm (56.00mm bore)

This kit includes a +2.00mm oversize piston (56.00mm bore). This increases displacement from 125cc to 134cc for more power! Your cylinder must be bored to 56.00mm to use this kit.

Kit Includes

• Wiseco Pro-Lite Piston - Lightweight 4032 aluminum alloy
• Ring Set - Wiseco performance rings
• Wrist Pin
• Circlips
• Wrist Pin Bearing
• Top End Gasket Set

Key Features

• Pro-Lite design for lightweight, high-revving 2-stroke performance
• 4032 aluminum alloy construction - optimized for 2-stroke applications
• Complete top-end gasket kit included
• Wrist pin bearing included - everything for a complete rebuild
• +2.00mm big bore for increased displacement (125cc to 134cc)

Important Notes

• Cylinder must be bored to 56.00mm
• Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC)
• Wiseco pistons can be fitted only with Wiseco rings
• Cylinder sleeves must be purchased separately if needed

Piston Specifications

• Bore Size: 56.00 mm (+2.00mm Big Bore)
• Piston Diameter: 55.95 mm
• Stroke Length: 54.50 mm
• Material: 4032 Aluminum Alloy
• Skirt Coating: Non-Coated
• Style: Pro-Lite

Engine Specifications

• Displacement: 125cc (stock) → 134cc (with this kit)
• Engine Type: 2-Stroke
• Weight: 0.85 lbs

Fitment

Yamaha:

• YZ125: 2005-2021
• YZ125X: 2020-2022

Why Wiseco Pro-Lite?

Wiseco Pro-Lite pistons are specifically designed for 2-stroke engines. The 4032 aluminum alloy provides excellent strength-to-weight ratio, allowing for higher RPM and quicker throttle response. The YZ125 is one of the most iconic 2-strokes ever made, and this big bore kit gives you the extra displacement to dominate!