I have a Johnson 20 h.p. outboard and am trying to get it running again..there is a pin hole in the diaphram and I want to rebuild the carburetor..however I dont know the serial number or model number to the outboard and cant find it anywhere..I have several numbers on the casting such as 308364 on the carb housing and 308357 on the motor housing underneath the carburetor..also a 378577 number on the latch..I need help with identifying my motor..thanks..
