1978 Johnson 4HP outboards Service Manual, Page 24Get this manual
free from all varnish and gum, and the leaves must be perfectly flat and without distortion so that they form perfect seal with the leaf plate baseSee Figure 3-9bDO NOT attempt to bend or repair damaged leaf; replace the complete assembly if damagedDO NOT under any circumstances bend or flex the leaves by hand cReplace the leaf stop if any leaves are broken1 29 4
Figure 3-7Inlet Needle Valve Seat Wear
dClearance under leaf stop should be 14" (6.35 mm); adjust if necessary by bending leaf stop See Figure 3-9
NEEDLE VALVES aInspect the tapered end of the needle valves for grooves, nicks, or scratches; replace if necessarySee Figure 3-8bDO NOT attempt to alter the shape of the needle valvesLEAF VALVES aInspect the leaf valve assembly and disassemble if necessaryThe leaf valves must be
1Leaf plate 2Leaf valve 3Leaf stop 4Alignment marks 514" (6.35 mm)