sure the gas in tank is fresh and is either regular or middle
grade unleaded, not premium. Premium unleaded turns bad the
quickest of the three. Fresh means gas that was pumped within
the last couple of weeks, not months. If you have a way to
siphon out and use gas for other things in the spring, then
completely top off the tank. Otherwise, having about a gallon
left works best.
the battery situated so that you will be able to charge it
about every three weeks. Either pull the battery out of the
bike, or make sure you can hook charger cables up while the
battery is still in the bike. I am not a fan of any chargers
meant to be hooked up constantly, called trickle, or maintenance
chargers. Modern batteries need to be recharged with enough
amperage to actively bubble the fluid. Fifteen minutes using
a six amp charger, or ninety minutes using a two amp charger,
will work just fine.