Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 349Get this manual
POWER TILT MOTOR Brush Measure the brush length
If the brush length is less than the service limit, replace the brush holder assembly
Standard
10 mm (0.4 in)
Service limit
6 mm (0.2 in)
Armature 1) Check the armature for wear or damageReplace if necessary2) Visually inspect the commutator surface for dust, rust or other damageIf necessary, wipe it with clean lint-free cloth or dress with fine emery cloth
3) Measure the mica depthIf the grooves are clogged, clean the grooves and measure the depth againIf the measurement is less than the service limit, replace the armatureService limit