Cylinder Works 08-09 Honda CRF 250 R 250cc Standard Bore High Compression Cylinder Kit 13.5:1 Comp.

This is a Cylinder Works high compression cylinder kit for the 2008 and 2009 Honda CRF 250 R. It's designed to bring your engine back to its original horsepower and performance levels, but with an improved compression ratio of 13.5:1. This kit is a solid option if you're looking to rebuild the top end of your CRF 250 R and want a noticeable bump in power.

The cylinder itself is cast aluminum, built to OEM style dimensions for a direct fit. What sets this kit apart is the Nickel Silicon Carbide (NSC) electroplate bore. This advanced plating allows for very tight tolerances, which means less friction as the piston moves and a bore that's extremely durable. It's also precision diamond honed to ensure the piston rings seal properly against the cylinder wall, which is crucial for both power and keeping oil where it belongs. This attention to detail in the bore finish helps with oil retention too, keeping things well-lubricated.

Included in the kit is a Vertex piston and all the necessary gaskets to get your engine back together. It's a complete package to restore your engine's performance. When you're putting this back into the engine, pay close attention to the piston ring installation and ensuring the cylinder head gasket is seated correctly to take full advantage of the improved compression.