I personally think they are useless. If you have excess corrosion, make sure all your electrical connections are clean along with your bonding wires.
Disconnect the battery first. May be 13MM bolts
Sorry, sometimes it is difficult to convince folks that there is a rubber drive hub / slip clutch inside the propeller.------You can not see this but
And maybe the motor mount to raise the engine a bit so the starter bolts come out.
I have not checked the gear oil yet. also where exactly is the prop hud on these motors. From my understanding it is like a bearing built into the propeller?