What is the bore size and displacement increase with this kit?

This Athena big bore kit increases the engine's bore size to 53mm, bringing the total displacement up to 105cc. This is a significant increase over the stock YZ85 engine.

What components are included in this gasket kit?

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

Does this kit require any modifications to install?

This kit is designed as a direct replacement for the stock cylinder and piston assembly on the specified Yamaha YZ85 models. Refer to the manufacturer's installation instructions for specific details.

Athena

Athena 02-18 Yamaha YZ 85 105cc 53mm Big Bore Cylinder Gasket Kit

Name: Athena 02-18 Yamaha YZ 85 105cc 53mm Big Bore Cylinder Gasket Kit
Brand: Athena
Price: 36.70 USD
Availability: InStock

$36.70

Fits 2002-2019 Yamaha YZ85. This Athena big bore kit increases displacement to 105cc with a 53mm bore, improving power.

Key Features

Direct fit — verified for 2002-2019 Yamaha YZ85
Big bore kit — increases engine displacement to 105cc with a 53mm bore size
Forged piston — well-built piston designed for durability
Galvanic coating — cylinder features a special coating for improved wear resistance

Fits this vehicle

Yamaha YZ85 2002-2019

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Product Details

Already running a performance exhaust on your YZ85? This Athena big bore cylinder gasket kit is the next piece to unlock more power. It increases the engine's displacement to 105cc with a 53mm bore size, giving you a noticeable boost in performance over the stock setup.