What is included in the Cylinder Works 20009 kit?

The kit includes a Cylinder Works cast aluminum cylinder with a Nickel Silicon Carbide (NSC) electroplate bore, a Vertex piston, and all the gaskets required for installation.

What are the benefits of the Nickel Silicon Carbide (NSC) bore?

The NSC bore allows for tighter tolerances, which leads to lower friction during piston movement. This can result in improved durability and potentially more efficient power delivery.

How does the diamond honing process benefit the cylinder?

The precision diamond honing ensures the bore is finished to exact dimensions with the proper surface texture. This is critical for achieving a good seal with the piston rings and for retaining oil, which helps protect the cylinder walls.

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Specifications

Brand: Cylinder Works
Part #: 20009
UPC: 714205039979

Cylinder Works 99-24 Yamaha YZ 250 250cc Standard Bore Cylinder 66.4mm

Name: Cylinder Works 99-24 Yamaha YZ 250 250cc Standard Bore Cylinder 66.4mm
Brand: Cylinder Works
SKU: cylinder-works-cylinder-works-99-24-yamaha-yz-250-250cc-standard-bore-cylinder-6-t14-728200
Price: 613.65 USD
Availability: BackOrder

$613.65

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 Standard Bore Cylinder 66.4mm. Restores horsepower and performance with a durable, low-friction bore.

Key Features

This kit includes a Cylinder Works cylinder, a Vertex Piston, and all necessary gaskets.
The cylinder features a Nickel Silicon Carbide (NSC) electroplate bore for reduced friction and increased durability.
The bore is precision diamond honed to exact dimensions for optimal ring seal and oil retention.
Cast aluminum construction helps with heat dissipation.
Designed as an OEM-style standard bore replacement for 1999-2024 Yamaha YZ 250 models.

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

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About this part

Product Details

What you get in this kit is a brand-new Cylinder Works cylinder, a Vertex piston, and all the gaskets you'll need to get your Yamaha YZ 250 back to its original horsepower and performance. This is an OEM-style standard bore kit, meaning it's designed to fit and function just like the original cylinder, but with some notable improvements in durability and efficiency.

The cylinder itself is cast aluminum, which is a solid choice for heat dissipation. What really sets this apart is the Nickel Silicon Carbide (NSC) electroplate bore. This advanced plating allows for much tighter tolerances, which translates to lower friction as the piston moves up and down. That lower friction means less wear over time and potentially a bit more power. It's also diamond honed to exact dimensions, ensuring a proper surface finish that helps the piston rings seal effectively and retain oil, which is crucial for engine longevity and consistent performance.

This kit is a well-built option for anyone looking to rebuild their Yamaha YZ 250's top end. It offers a competitive price point compared to going with a full OEM replacement, while still giving you the performance and durability you'd expect for your bike.