John V , posted to draw some ATF into the carb like if you were priming the engine to start. That keeps it lubricated and no danger of fuel gumming up inside over the winter
I take them apart, shoot Gumout through every orifice, rub a little wd40 on new gaskets, new dry diaphragms and you're good to go. Don't forget new gas tubing and IV bag.
With all my giant scale gasser airplanes I always run them dry at the end of the day and if I am storing for extended time I spin with the starter abut to make sure the carb is dry. I run 100 octane aviation gas with redline oil, my diaphragms last for years. If I run a gas boat I would have to be convinced to do any different. JM2C