1975 Johnson 4HP 4R75, 4W75 Outboards Service Manual, Page 39Get this manual
DISASSEMBL POWER HEAD aRemove the armature support plate and retaining ringNote position of retaining ringSee Figure 5-5
bRemove cylinder head and gasket by removing the six head screwsSee Figure 5-5cRemove exhaust cover and gasket by removing the seven cover plate screwsSlide cover out from under starter bracketSee Figure 5-5