What is the bore size for this kit?

This Athena big bore kit is designed for a 58mm cylinder bore, increasing the displacement to 144cc.

What is included in this gasket kit?

The kit includes the aluminum cylinder with a galvanic coating, a forged piston with a molybdenum coating, and the necessary gaskets for installation.

Is this kit street legal?

This kit is intended for off-road use only and may not be compliant with emissions regulations for street use.

Athena

Athena 05-21 Yamaha YZ 125 LC 144cc 58mm Big Bore Cylinder Gasket Kit

Name: Athena 05-21 Yamaha YZ 125 LC 144cc 58mm Big Bore Cylinder Gasket Kit
Brand: Athena
Price: 68.06 USD
Availability: InStock

$68.06

Fits 1987-2006 Yamaha YFZ350 Banshee. This Athena gasket kit is for a 144cc big bore setup, including a forged piston with molybdenum coating.

Key Features

Direct fit — verified for 1987-2006 Yamaha YFZ350 Banshee and 2005-2021 Yamaha YZ125
144cc big bore kit — designed for a 58mm cylinder bore
Forged piston included — features a molybdenum coating for improved durability
Aluminum cylinder — built with a galvanic coating design

Fits these vehicles

Yamaha YFZ350 Banshee 1987-2006
Yamaha YZ125 2005-2021

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Product Details

Already running a big bore setup? This Athena gasket kit is the next piece for your 144cc conversion. It's designed for the Yamaha YFZ350 Banshee and YZ125 models, specifically for a 58mm bore size.