What is the main benefit of this big bore kit?

This kit increases your Yamaha YZ125's engine displacement from stock to 144cc. This generally results in more horsepower and torque, giving you improved acceleration and overall performance.

What is the purpose of the molybdenum coating on the piston?

The molybdenum coating on the forged piston helps reduce friction during operation. It also aids in the initial break-in process and can improve wear resistance over time.

Does this kit include everything needed for installation?

This kit includes the big bore cylinder, a forged piston with molybdenum coating, and the necessary gasket kit. You will need to ensure you have other required tools and fluids for the engine rebuild.

Athena

Athena 97-04 Yamaha YZ 125 LC Factory 144cc 58mm Big Bore Cylinder Gasket Kit

Name: Athena 97-04 Yamaha YZ 125 LC Factory 144cc 58mm Big Bore Cylinder Gasket Kit
Brand: Athena
Price: 68.06 USD
Availability: InStock

$68.06

Fits 1997-2004 Yamaha YZ125. Athena 144cc big bore cylinder gasket kit with forged piston.

Key Features

Direct fit — verified for 1997-2004 Yamaha YZ125
144cc Big Bore — Increases engine displacement for more power.
Forged Piston — Includes a forged piston with a molybdenum coating.
Galvanic Cylinder Coating — Cylinder features a galvanic coating for durability.
Complete Gasket Kit — Includes all necessary gaskets for installation.

Fits this vehicle

Yamaha YZ125 1997-2004

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Product Details

Athena makes this 144cc big bore cylinder gasket kit for the 1997-2004 Yamaha YZ125. This kit increases displacement to 144cc for more power.

The cylinder has a galvanic coating for durability. The included forged piston has a molybdenum coating, which helps with break-in and reduces friction.