(When replacing your stock (OEM) carburettor, installation of the replacement carburetor may require exchanging of jets and/or throttle butterfly.) This Mikuni super BN carburetor is the original equipment replacement for Yamaha Superjet Jet Ski. Features standard stock jetting, butterfly choke, and 44mm main bore. Bolt centers on the motor end are 75mm apart Bolt centers on the the air-cleaner end horizontally and vertically are 45mm apart.