Cylinder Works 20-23 Yamaha WR 250 F 250cc Standard Bore Cylinder Kit 13.8:1 Comp. 77mm

This Cylinder Works kit gives you everything you need to rebuild the top end of your 2020-2023 Yamaha WR 250 F. Inside the box, you'll find a cast aluminum Cylinder Works cylinder, a Vertex piston, and all the necessary gaskets to get your engine running like new again. It's a complete package designed to bring back lost horsepower and performance, offering a solid alternative to expensive OEM parts.

The cylinder itself is built with a nickel silicon carbide (NSC) electroplate bore. This advanced plating technique allows for very tight tolerances, which means less friction as the piston moves up and down. That lower friction translates to better efficiency and a longer-lasting engine. Plus, this bore finish is incredibly durable. It's also precision diamond honed to exact dimensions and the right surface finish, which is crucial for ensuring your piston rings seal properly against the cylinder wall. Good ring seal is key for both power and keeping oil where it belongs, preventing it from getting into the combustion chamber.

With a 13.8:1 compression ratio and a 77mm standard bore, this kit is built to restore the original performance of your WR 250 F. It's a well-built component that will help you get back on the trail with confidence.