What is a big bore stroker kit?

A big bore stroker kit increases your engine's displacement by making the cylinder bore larger and increasing the piston's stroke. This generally results in more power and torque from the engine.

Does this kit come with everything needed for installation?

The kit includes the aluminum cylinder with galvanic coating and a forged piston with molybdenum coating. You will need to refer to the manufacturer's installation instructions for any additional parts or fluids required.

Can this kit be shipped to California?

No, this kit is not CARB approved and cannot be shipped to California due to emissions regulations.

Athena

Athena 02-18 Yamaha YZ 85 Complete Cylinder Big Bore Stroker Kit

Name: Athena 02-18 Yamaha YZ 85 Complete Cylinder Big Bore Stroker Kit
Brand: Athena
Price: 1058.14 USD
Availability: InStock

$1058.14

Fits 2002-2019 Yamaha YZ85. Athena big bore stroker kit with aluminum cylinder and forged piston for improved performance.

Key Features

Direct fit — verified for 2002-2019 Yamaha YZ85
Aluminum cylinder with galvanic coating — helps with heat dissipation
Forged piston with molybdenum coating — reduces friction and wear
Increases engine displacement — for more power

Fits this vehicle

Yamaha YZ85 2002-2019

Need Help?

631-982-0042

Fast Shipping

Nationwide delivery

Secure Checkout

Safe & protected

Since 1957

Family-owned

Product Details

Already running a performance exhaust and intake on your YZ85? This Athena big bore stroker kit is the next piece to unlock more power. It replaces the stock cylinder and piston with larger, well-built components designed to increase displacement and improve engine output.

This kit features an aluminum cylinder with a galvanic coating for better heat transfer and durability. The included forged piston has a molybdenum coating, which helps reduce friction and wear. These components work together to allow for a larger stroke, giving your YZ85 a significant boost in performance.