Geremy,
the guys are right on. The only things I would suggest:
Blow out gas from all your lines-they will need to be changed out next season.
Empty the gas tank completely
Cover the kart
drain the oil
With me I don’t have to worry about storing as I completely dismantle the kart down to the bare chassis, clean, check everything, replace, send motor off to be checked/refreshed and then rebuild it all back up.
This is a good way to learn the mechanics of your kart-I would suggest this. Of course the Boss of the house-wife-would have something to say about that! :argue