What is the bore size for these piston rings?

These piston rings are designed for a 77mm bore. This matches the stock bore size for the 2008-2013 Yamaha WR250R and WR250X models.

Are these rings compatible with a stock piston?

These rings are designed to work with forged pistons, often found in upgraded or replacement kits. It's best to confirm your piston type before installation.

Can these rings be shipped to California?

No, these piston rings are not CARB approved and cannot be shipped to California.

Athena

Athena 08-13 Yamaha WR 250 R/X 250cc 77mm Bore Piston Ring Set

Name: Athena 08-13 Yamaha WR 250 R/X 250cc 77mm Bore Piston Ring Set
Brand: Athena
Price: 51.55 USD
Availability: InStock

$51.55

Fits 2008-2013 Yamaha WR250R/X. This Athena piston ring set is a direct replacement for worn rings, restoring compression.

Key Features

Direct fit — verified for 2008-2013 Yamaha WR250R, WR250X, and YZ250F
Restores compression — seals the combustion chamber to prevent blow-by
77mm bore size — matches stock dimensions for a proper fit
Forged piston compatibility — designed to work with forged pistons
Galvanic coating — cylinder coating for improved wear resistance

Fits these vehicles

Yamaha WR250R 2008-2013
Yamaha WR250X 2008-2011
Yamaha YZ250F 2008-2013

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Product Details

Already running a rebuilt or upgraded engine? This Athena piston ring set is the next piece you need. It's a direct replacement for your 2008-2013 Yamaha WR250R or WR250X, designed to restore proper compression and seal.

The rings are made to fit a 77mm bore, matching the stock size for these 250cc bikes. This set is part of a larger kit that includes an aluminum cylinder with a galvanic coating and a forged piston with a molybdenum coating, ensuring good performance and durability.