Niche Industries PW80 Top End Kits are the best value kits online. This Kit includes original equipment type Cylinder Head, Cylinder, Piston Kit and Performance Gaskets. The Cylinder has been factory honed and deburred to help your new top end work efficiently and is solid cast iron and a black powder coat has been added to give the Cylinder that vintage Yamaha look. The Cylinder Head is powder coated cast aluminum and machined to provide standard compression. All kit components are manufactured to the same size and standards as your originals. Our kits have been engineered and tested to exceed original equipment standards. When your rebuild kit arrives, your parts are in mint condition and ready to install. No modification required. Quality and Performance guaranteed.