Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 63Get this manual
HONDA BF2OA25A
5) Turn the camshaft counterclockwise by cam pulley gear
teeth or more, then turn the camshaft clockwise until the timing mark is at the gear teeth before the cylinder head "Tf" mark, i.e, gear teeth before the top dead center of the No1 cylinder
[I CAM PULLEY
The correct tension for the timing belt is automatically adjusted by the tensionerDo not apply additional force the timing belt tensoner
6Tighten the belt tensioner 10 38 rnm flange bolt to the specified torqueTORQUE: 45 N-rn (4.5 kg-m, 32.5 ft-lb)
After adjustment, install the following parts: Exciter coil, charge coil [Electric starter typel, flywheel, starter pulley and flywheel cover [Electric starter typel (P.6-1)Recoil starter-, engine hanger bracket (P.6-3) and engine cover (P.4-1)Spark plugs