Put a toy to bed correctly and leave it alone. When you start them all you do is introduce H20 (by-product of combustion) into the system. This does nothing good and leaving it to idle does not get the water out, not to mention what may remain in the pipes. Yes, remove the battery and place it on a Battery-Tender and it'll be fine for next year.
I pass this on after being in the powersports business for over 20 years. take it for what you will.