Honda BF115A, BF130A Outboard Motors Shop Manual., Page 80Get this manual
12) Check whether the cutout in the crankshaft pulley aligns with the "'tT" mark on the timing belt lower coverIf they are not in proper alignment, reinstall the timing belt 111CRANKSHAFT
13) Remove the 16 49 mm bolt-washer and the crankshaft pulleyInstall the balancer belt (f? 3-16)14) After installing the balancer belt, tighten the 10 mm bolt against the timing belt tensioner and loosen the adjusting nut 213 to turnAdjust the balancer belt tension
Timing BeltIBalancer Belt Tension Adjustment:
1 111TIMING BELT
Be sure that the valve clearance is correct before adjusting the belt tension (P3-51The balancer belt tension and the timing belt tension should be adjusted simultaneously1) Turning the crankshaft pulley clockwise, align the "4T" mark