Just take the seawater pump belt off and u can run it about 1 min+ ,,,i awsume u whant to set the timing or something of that nature ???? but i agree,,WATER is your friend

This was the best response GLH!! Good one! It only takes about 2 minutes to hook up a hose and run water to the water muffs for the outdrive. No reason to potentially cause damage when the cost of the muffs is less than an impellor kit!
Sorry, just my thoughts.

I didnt want to run water through the ngines yet....shouldnt freeze but didnt want to take the chance.

Jerry rig muffs with a hose in a 5 gallon bucket or two of winterizing fluid.

BTW don't do that over grass.... My father in law had a 20' circle of dead grass for a summer a few years back he was really proud of me for!!!