As others have said regarding fuel...dry. Two reasons: rot, and not many saws are absolutely tight, and may leak bar oil and mix. Evaporation INSIDE the carb even...leaving you with mostly oil inside the carb held together with varnish.
Not your best day.
I buy those lag-screw hooks meant for bicycles and ladders and things at the hardware store, run 'em into ceiling joists, and hang saws, string trimmers and a few other things from the ceiling in my shop. Dry, out of the way, and looks cool. Parts saws and projects-to-be reside in plastic tubs in the hayloft of the barn with the lids on.