What exactly is included in this cylinder kit?

This kit comes with a cast aluminum Cylinder Works cylinder, a Vertex piston, and all the gaskets required for installation. It's designed to be a complete top-end restoration package.

What is the benefit of the nickel silicon carbide (NSC) bore?

The NSC electroplate bore allows for very tight tolerances, which reduces friction during piston movement. It also provides extreme durability, contributing to a longer lifespan for the cylinder.

How does the diamond honing process benefit the engine?

Precision diamond honing creates the exact dimensions and proper surface finish needed for the piston rings to seal effectively against the cylinder wall. This also ensures good oil retention, which is vital for proper lubrication and engine health.

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Specifications

Brand: Cylinder Works
Part #: 20009-K02
UPC: 714205039993

Cylinder Works 99-23 Yamaha YZ 250 250cc Standard Bore Cylinder Kit

Name: Cylinder Works 99-23 Yamaha YZ 250 250cc Standard Bore Cylinder Kit
Brand: Cylinder Works
SKU: cylinder-works-cylinder-works-99-23-yamaha-yz-250-250cc-standard-bore-cylinder-k-t14-728194
Price: 965.56 USD
Availability: BackOrder

$965.56

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 99-23 Yamaha YZ 250 250cc Standard Bore Cylinder Kit. Restores horsepower and performance with a complete kit.

Key Features

This kit includes a cast aluminum Cylinder Works cylinder, a Vertex Piston, and all necessary gaskets.
Features a nickel silicon carbide (NSC) electroplate bore for tighter tolerances and lower friction.
The NSC bore offers extreme durability for long-lasting performance.
Cylinder bore is precision diamond honed to exact dimensions for optimal ring seal and oil retention.
Designed to restore original horsepower and performance to your Yamaha YZ 250.
Offers a competitive price point compared to OEM cylinder options.

This cylinder kit is designed for Yamaha YZ 250 models from 1999 to 2023.

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About this part

Product Details

This Cylinder Works kit gives you everything you need to get your Yamaha YZ 250 back to its original horsepower and performance. Inside the box, you'll find a cast aluminum Cylinder Works cylinder, a Vertex piston, and all the necessary gaskets to complete the job. It's a solid option for restoring your engine, especially when compared to the cost of OEM parts.

The cylinder itself is built with a nickel silicon carbide (NSC) electroplate bore. This advanced plating allows for very tight tolerances, which means less friction as the piston moves. It also contributes to extreme durability, so you can expect this cylinder to hold up well over time. To ensure the best possible performance and longevity, the bore is precision diamond honed to exact dimensions. This process creates the proper surface finish needed for good ring seal and effective oil retention, which are crucial for a healthy engine.

This kit is designed as an OEM-style replacement, making it a straightforward way to rebuild your top end. If you're looking to bring your YZ 250's engine back to life with reliable components, this cylinder kit is a well-built choice.