Re: 25 hp Bigfoot flywheel
I'm drinking tea this morning instead of my usual pot of coffee, maybe that explains my confusion over your question.
Flywheel degree, usually the degree marks on a flywheel are used setting the ignition timing and have nothing to do with temperature.
Outboard motors are self-draining as soon as the motor is shut off, there should be no worries of freezing the motor.
The gearcase should have the oil changed to be sure there is no water leaked in that could freeze, expand and break the case.
As long as the boat and motor are out of the water and the motor is trimmed level then no rain water can pool in the exhaust passage of the lower unit.
Hope this is what you were asking, if not repost more detailed questions and we can try again.