Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 335Get this manual
3) Align the pin hole to the tilt stopper and tilt stopper cam as shown and drive the 2.5 20 mm spring pin using commercially available pin driver until the pin end aligns with the tilt stopper cam as shown PIN DRIVER
[41TILT STOPPER CAM
TILT STOPPER
4) Install the detent spring and tighten the 12 mm flange bolt securelyApply grease to the roller of the detent spring
1I DETENT SPRING