Yamaha F100B F100C Outboards Factory Service Manual, Page 251Get this manual
Power trim and tilt motor (F100B) Disassembling the power trim and tilt motor
1Remove the PTT motor screws2Remove the lead holder and spacer from the yoke 3, and then slide them towards the leads
CAUTION:
Do not touch the bimetal a, otherwise the operation of the breaker may be affectedNOTE: Hold the brush with screwdriver as shown, and then disconnect the PTT motor lead (blue)