What is the main benefit of this big bore kit?

This kit increases your engine's displacement to 478cc with a 98mm bore. This generally results in improved power and torque output for your Yamaha motorcycle or ATV.

What makes the piston in this kit different from a stock piston?

The kit includes a forged piston, which is known for its strength and durability compared to cast pistons. It also features a molybdenum coating to help reduce friction during operation.

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

This kit contains the cylinder and piston assembly along with the necessary gaskets for the conversion. Always refer to the manufacturer's installation guide for any additional components or fluids that may be required.

Athena 03-06 Yamaha WR 450 F 478cc 98mm Big Bore Cylinder Gasket Kit

Specifications

Brand: Athena
Part #: P400485160009
UPC: 8050444899281

Athena 03-06 Yamaha WR 450 F 478cc 98mm Big Bore Cylinder Gasket Kit

Name: Athena 03-06 Yamaha WR 450 F 478cc 98mm Big Bore Cylinder Gasket Kit
Brand: Athena
Price: 102.11 USD
Availability: InStock

$102.11

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2004-2011 Yamaha YFZ450. This gasket kit includes a forged piston with molybdenum coating for improved performance.

Key Features

Fits 2003-2006 Yamaha WR450F, 2004-2011 Yamaha YFZ450, and 2003-2005 Yamaha YZ450F.
Increases engine displacement to 478cc with a 98mm bore.
Includes a forged piston, which is stronger and more durable than cast pistons.
Features a molybdenum coating on the piston to help reduce friction.
Comes with an aluminum cylinder that has a galvanic coating for heat transfer and wear resistance.

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Fits these vehicles

Yamaha WR450F 2003-2006
Yamaha YFZ450 2004-2011
Yamaha YZ450F 2003-2005

Product Details

When you're looking to get more out of your Yamaha WR450F, YFZ450, or YZ450F, this big bore cylinder gasket kit from Athena is a solid choice. It's designed to work with a 98mm bore, bumping your engine's displacement to 478cc. This means you can expect a noticeable increase in power and torque when you get back on the trail or track.

Athena uses a forged piston with a molybdenum coating in this kit. Forging makes the piston stronger and more durable than cast pistons, which is important when you're increasing displacement and potential stress on the engine. The molybdenum coating helps reduce friction, allowing the piston to move more freely within the cylinder. The kit also includes an aluminum cylinder with a special galvanic coating, which is designed for good heat transfer and wear resistance.

This kit is a comprehensive solution for upgrading your engine's performance. Make sure to follow the manufacturer's installation instructions carefully to ensure everything is sealed properly for optimal results.