Some of the older lower units - before the nose cone water pick-ups will hold water if tilted up. Especially to the extreme. The water is not in the gearcase, but standing in the housing. If it freezes hard enough, it will crack the housing. Tilting the motor down will ensure that it drains. If it is stored outside, even if you drained it at the lake rain will collect enough that they can freeze and crack if stored tilted way up. It takes a real hard freeze, but it can happen.
Covering it will do no good. No heat. Just drain it and keep it down.
By the way, that goose down is not hypoallergenic, and that SHO will start sneezing!
Total Recreation Products Inc.
Commercial Park and Playground Products and Services
Ranger Z520 250ProXS