First of all Kat, if that barn has every had cows or horses in there, then you don't want to store you bike in there. Might sound like a dumb thing to say, but actually it's not, and here's why. If it's ever been used to house livestock, especially over many years, then the dirt floor has been saturated with urine and that biodegrades into ammonia, which mixes with certain elements in the ground to form ammonia nitrate or a compound closer enough to it. It will turn anything metal into a rusty mess in no time. Metal does not have to touch it, it's in the air Now with all that said, if it's just a storage shed or barn: If the floor is earth then the tires must not touch it. You need to shut off the fuel petcock and run the engine till it stops. then Turn Ignition OFF. remove the battery and store in a wam place, if possible, off the ground, especially concrete. It is preferable to put fresh motor oil in prior to layup. Put the recommended amount of Sta-bil in the fuel tank. It is also preferable to have the fuel tank completely full. Then cover the entire bike with a breathable cover.