Compatible With: (JS300 with BN34 Carburetor), (JS440 with BN38 Carburetor), (JS550 with BN38 Carburetor), (JS550 with BN44 Carburetor) Compatible With: 34, 38, 44mm Personal Watercraft Carburetors Including for Kawasaki Jet Ski models OEM Part Number: MK-BN38/44 OEM Carburetor Rebuild Kit MK-BN38/44 SPR Compatible With Kawasaki Mikuni PWC for Mikuni BN 34, 38, 44mm Personal Watercraft Carburetors Including for Kawasaki Jet Ski models JS300 with BN34 Carburetor, JS440 with BN38 Carburetor, JS550 with BN38 Carburetor, JS550 with BN44 Carburetor. Carburetor Rebuild Kits for both Original Equipment and aftermarket Mikuni BN 34mm, BN38mm and BN44 Personal Watercraft Carburetors. These Kit replaces vital components in the Carburetor including the fuel pump diaphragm, Gaskets, Seals, and Float Bowl Screws to return the popular Watercraft Carburetor to like-new operation.