Honda BF15D BF20D Outboard Motors Shop Manual., Page 61Get this manual
Adjustment If the valve clearance adjustment is necessary, proceed as follows: 1) Hold the valve adjusting screw using the valve adjust wrench and loosen the lock nut 2) Turn the valve adjusting screw to obtain the specified intake and exhaust valve clearancesValve clearances IN: 0.150.19 mm (0.0060.007 in) EX: 0.210.25 mm 0.0080.010 in)
3) Hold the valve adjusting screw and tighten the lock nut to the specified torque
VALVE NUT OUSTING SCREW
[3] VALVE ADJUST WRENCH
TORQUE: N-m (0.8 kgf-m, 5.8 Ibf-ft)
4) Recheck the valve clearance after tightening the lock nut5) After adjustment, install the cylinder head cover and tighten the 22 mm flange bolts securelyMake sure that the head cover gasket is in the place6) Connect the breather tube and set the throttle cable to the hook on the cylinder head cover (tiller handle type only)HEAD COVER
CYLINDER
7) Install the following removed parts:the starter case (P7-10)3the recoil starter (P7-9)- the left engine under cover (P.5-2)Make sure that the wire harnesses and connectors are set in the place correctly (see pages 2-29 through 2-37 for wire harness and cable routing)