Cylinder Works 02-18 YZ 85 Standard Bore Cylinder Kit

This Cylinder Works kit gives you everything you need to rebuild the top end of your 2002-2018 Yamaha YZ 85. Inside, you'll find a cast aluminum cylinder, a Vertex piston, and all the necessary gaskets to get your engine back to its original performance level. It's a well-built option that offers a competitive price point compared to buying individual OEM parts.

The cylinder itself features a nickel silicon carbide (NSC) electroplate bore. This advanced plating allows for tighter tolerances, which means less friction as the piston moves up and down. That tighter tolerance, combined with the extreme durability of the NSC plating, helps restore lost horsepower and ensures the engine runs smoothly. The bore is also precision diamond honed to exact dimensions and has a proper surface finish. This is crucial for ensuring the piston rings seal correctly against the cylinder wall, which is key for both compression and retaining oil where it needs to be.

This kit is designed to be a direct replacement, making the rebuild process more straightforward. Having all the essential components in one package simplifies the job and ensures you have the right parts for a successful engine restoration.