My moneys on the float bowl...notorious problem with warriors...especialy warriors that have been sitting. if you store a quad (4 stroke)run with the gas "shut off" to the off position until it stalls. this will use up the gas in the bowl. (or use the float drain supplied on the carb.that makes more sense...so i don't do that.) anyways if you don't. the gas evaporates, leaving a risidue behind from additives. the floats can stick if theres enough build up.

i've also heard of the floats taking on gas and sinking, with warriors.

good luck