Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 152Get this manual
bINSTALLATION BELT
11 24 mm LOCK NUT
121 TIMING BELT DRIVE PULLEY 1I GUIDE PLATE
BELT PULLEY
WOODRUFF KEY
1) Remove the spark plug caps and spark plugs
2) Install the timing belt driven pulley on the camshaft by aligning the key of the pulley with the key groove of the camshaft3) Apply oil to the thread and seating surface of the 20 mm flange bolt and tighten it to the specified torque