What is the main benefit of this big bore kit?

This kit increases your engine's displacement to 290cc, which generally results in more horsepower and torque compared to the stock engine size.

What does the molybdenum coating on the piston do?

The molybdenum coating on the piston helps reduce friction between the piston and cylinder wall. This can lead to improved performance and potentially longer piston life.

Does this kit include everything needed for the big bore conversion?

The kit includes the aluminum cylinder, a forged piston, and the necessary gasket set. It is recommended to consult the manufacturer's instructions for any additional parts or modifications that may be required for installation.

Athena

Athena 01-12 Yamaha WR 250 F 290cc 83mm Big Bore Cylinder Gasket Kit

Name: Athena 01-12 Yamaha WR 250 F 290cc 83mm Big Bore Cylinder Gasket Kit
Brand: Athena
Price: 76.12 USD
Availability: InStock

$76.12

Fits 2001-2013 Yamaha YZ250F and 2001-2012 WR250F. Athena 290cc big bore cylinder gasket kit for improved power.

Key Features

Direct fit — verified for 2001-2013 Yamaha YZ250F and 2001-2012 WR250F
290cc displacement — increases engine size for improved power output.
83mm bore size — specific piston and cylinder dimensions for this kit.
Forged piston with molybdenum coating — offers good durability and reduced friction.
Aluminum cylinder with galvanic coating — lightweight construction with a protective finish.

Fits these vehicles

Yamaha WR250F 2001-2012
Yamaha YZ250F 2001-2013

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Product Details

Already running a modified WR250F or YZ250F? This Athena 290cc big bore cylinder gasket kit is the next piece to get more power out of your engine. It increases displacement to 290cc with an 83mm bore size.