Honda BF35A-BF45A Outboard Motors Shop Manual., Page 412Get this manual
Armature 1) Check the armature for wear and damageReplace if necessary2) Visually inspect the commutator surface for dust, rust and 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 1.3 mm (0.05 in)
MICA DEPTH