What is included in this power valve kit?

This kit includes a Cylinder Works cast aluminum cylinder with a 72mm bore, a Vertex piston, and all the gaskets needed for installation to restore your engine's performance.

What makes the cylinder bore durable?

The cylinder features a nickel silicon carbide (NSC) electroplate bore, which is known for its extreme durability and ability to maintain tight tolerances. It's also precision diamond honed for optimal ring seal and oil retention.

Is this a direct replacement for the stock cylinder?

This kit is designed as an OEM-style replacement to restore horsepower and performance. It includes the cylinder, piston, and gaskets for a comprehensive rebuild solution.

Specifications

Brand: Cylinder Works
Part #: CW-PV-K02
UPC: 714205042375

Cylinder Works 99-24 Yamaha YZ 250 250cc 72mm Big Bore Power Valve Kit

Name: Cylinder Works 99-24 Yamaha YZ 250 250cc 72mm Big Bore Power Valve Kit
Brand: Cylinder Works
SKU: cylinder-works-cylinder-works-99-24-yamaha-yz-250-250cc-72mm-big-bore-power-valv-t14-728198
Price: 375.20 USD
Availability: BackOrder

$375.20

On Backorder

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

Cylinder Works 99-24 Yamaha YZ 250 250cc 72mm Big Bore Power Valve Kit. Restores horsepower and performance with a durable, low-friction bore.

Key Features

Fits 1999-2024 Yamaha YZ 250 models.
Features a 72mm bore for a 250cc displacement.
Includes a cast aluminum Cylinder Works cylinder, Vertex Piston, and necessary gaskets.
Nickel silicon carbide (NSC) electroplate bore allows for tighter tolerances and lower friction.
Precision diamond honed bore ensures proper ring seal and oil retention for durability.

This kit is designed for 1999-2024 Yamaha YZ 250 models.

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About this part

Product Details

If you're looking to bring your Yamaha YZ 250 back to life after a rebuild, this big bore power valve kit from Cylinder Works is a solid option. It's designed to get your 250cc two-stroke running strong again, offering a way to restore lost horsepower and performance without breaking the bank compared to OEM parts.

What sets this kit apart is the cylinder's bore. It features a nickel silicon carbide (NSC) electroplate, which is a really durable finish that allows for tighter tolerances. This means less friction when the piston moves, leading to better efficiency and a longer lifespan for the cylinder. The bore is also precision diamond honed to exact dimensions, ensuring a proper surface finish for good ring seal and oil retention, which is crucial for keeping your engine running smoothly and preventing blow-by.

This kit comes with the cylinder, a Vertex piston, and all the necessary gaskets to get the job done. It's a complete package to help you get your YZ 250 back on the track or trail with renewed power.