1972 Johnson 4HP Outboard Motor Service Manual, Page 38Get this manual
DISASSEMBL POWER HEAD Remove the armature support plate and retaining ringNote position of retaining ringSee Figure 5-5
Remove cylinder head and gasket the six head screwsSee Figure 5-5
removing
Remove exhaust cover and gasket removing the seven cover plate screwsSlide cover out from under starter bracketSee Figure 5-5