1978 Johnson 4HP outboards Service Manual, Page 22Get this manual
REMOVAL OF CARBURETOR AND LEAF VALVE ASSEMBLY aRemove motor coverbPull off low speed knobRemove cotter and hinge pin to remove choke knobSee Figure 32
cRemove power pack Disconnect cam follower and linkdDisconnect Figure 3-3fuel hose at carburetorSee
eRemove carburetor by removing the two attaching nutsSee Figure 3-3fRemove four intake manifold cap screwsSee Figure 3-3Remove manifold, gaskets and leaf plate assembly from powerheadSee Figure 3-4
1Cotter and hinge pin 2Choke knob Figure 3-2Remove Choke Knob