Fogging is useless. All it does is gum a carburetor..badly. Yes you are going to clean the carburetors regardless before the season but less crap you have to remove the better. What I do and I use ethanol fuel after the 1st tank of 93 without it. I take as much out as I can, put in some stabil then run it for 10 minutes so the stabil is in the system then hit the shut off valve and let it slowly die out. Also once the engine is cooled down we spray some penetrating oil or lubricating oil and pull it over several times. Once a month we pull the spark plugs and do that again. That way it keeps the cylinders lubricated and helps stop them from getting stuck or rusted up over the summer. I also don't remove the belt either not in any of the 43 years of riding have we done that. Never had an issue at all. As he said grease all the fittings, check the slides/hyfax for anywhere and if possible yes have the track off the ground. I have ours on snowmobile dolly's so we can move them around the garage. Also now is the time to make a list of what you need to work on later on in the summer early fall. As best to do it then and not when its 10 degrees outside with snow on the ground,lol.