What is the compression ratio of this piston?

This JE Pistons single piston features a compression ratio of 12.8 to 1. This is higher than stock and is intended to increase engine power.

Is this piston compatible with all Yamaha YZ 450F models?

This piston is designed for Yamaha YZ 450F engines. It's always a good idea to verify fitment with the manufacturer's specific application data for your model year.

Can this piston be shipped to California?

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

JE Pistons Yamaha YZ 450F 12.8:1 Piston 274183S

Name: JE Pistons Yamaha YZ 450F 12.8 to 1 Piston Single
Brand: JE Pistons
SKU: je-pistons-je-pistons-yamaha-yz-450f-12-8-to-1-piston-single-t14-695366
Price: 374.99 USD
Availability: BackOrder

JE Pistons Yamaha YZ 450F 12.8 to 1 Piston Single

$374.99

On Backorder

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

JE Pistons 12.8:1 compression piston for Yamaha YZ 450F.

Key Features

This is a single JE Pistons piston with a 12.8 to 1 compression ratio.
Forged aluminum construction offers improved strength and durability over cast pistons.
Designed for Yamaha YZ 450F engines.
Not CARB approved; cannot ship to California.

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Product Details

If you're looking to get more performance out of your Yamaha YZ 450F's engine, a higher compression piston like this one from JE Pistons can make a notable difference. This piston is designed to increase the compression ratio to 12.8 to 1, which means more power when you hit the throttle. It's a solid option for riders who want to feel a stronger pull from their bike.

JE Pistons are well-known in the performance world for their forged pistons, and this unit is no exception. Forging the aluminum makes it stronger and more durable than cast pistons, allowing it to handle the increased pressures that come with higher compression. This piston is a single unit, meaning you'll need to order the correct quantity for your engine. It's built to fit your Yamaha YZ 450F, so you can expect it to install without major modifications, assuming you're comfortable with engine internals.

Keep in mind that this piston is not CARB approved and cannot be shipped to California. If you're rebuilding your top end and want a noticeable bump in power, this JE Pistons unit is a strong choice.