Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 58Get this manual
Adjustment If the valve clearance adjustment is necessary, proceed as follows: 1) Hold the valve adjusting screw using the valve adjusting wrench and loosen the lock nut
[ LOCK NUT
121VALVE ADJUSTING
2) Turn the valve adjusting screw obtain the specified
intake and exhaust valve clearances3) Hold the valve adjusting screw and tighten the lock nut to the specified torquef41 THICKNESS GAUGE
131 VALVE ADJUSTING WRENCH 07908-KE90200
TORQUE: N-m(0.8 kgf-m, 5.8 Ibfft)
4) Recheck the valve clearance after tightening the lock nut