Get some Sta-bil gas additive and follow the directions. I always fill my tank up and add the amount of Sta-bil based on that. You don't need to remove the battery - just disconnect the terminals. Next summer, when you reach 50 hrs. or so, you're going to need to change the tranny fluid and filter to remove any possible schlock that's sloughed off the new tranny. Seems too soon I know, but the senior poster on here strongly recommends it. It's not a big deal to do on a JD X-370. I don't know about the Cub. Cheers!