Description: 40mm Cylinder Bore FITS: Yamaha PW50: 1981-2018 Direct Replacement For: L5-11111-02-00, BP4-HS000-00-00, 95380-06600-00, 93450-11021-00, 93310-210M0-00, 90116-06269-00, 517-11181-01-00, 3PT-11351-00-00, 3L5-11311-01-00, 3L5-11111-02-00, 2E9-11633-00-00, 260-11601-03-00, 18U-11636-00-00, 18U-11635-00-00, 18U-11631-00-A0 This kit includes the hardware type: cylinder head, cylinder, piston kit and performance gaskets. The cylinder is machined from one piece cast iron and a black powder coat has been added to give the cylinder a vintage look. The cylinder head is cast aluminum with a powder coat finish and machined to provide stock compression. Our kits have been engineered and tested to exceed original equipment standards. When your rebuild kit arrives, your parts will be in perfect condition and ready to install. No modifications are required. Quality and performance guaranteed! Includes: Cylinder, Cylinder Head, Piston, Piston Rings, Pin, Needle Bearing, Snap Rings (2), Head Gasket, Base Gasket, Cylinder Studs (4), Cylinder Stud Nuts (4), Spark Plug