Float Bowl Gasket Only Kits - An economical way to reseal a leaky carburetor. - Includes one gasket per kit. Multi carburetor bikes will require multiple kits. - Applications that use paper float bowl gaskets are upgraded to high performance interface gasket material. - NBR rubber is used for gaskets (NBR has excellent resistance to ethanol used in today's fuels.) Fits: Polaris TRAIL BOSS 250 2x4 1988 Yamaha WR250 Z 3RB 1992-1993 WR250 Z 4JW 1994-1997 WR500 1994 WR500Z 1992-1993 YZ490 1987-1990