There usually is a lot of debate on this issue, but personally, i run my sleds about once a month for about 15 minutes during the summer. i've never had to clean the carbs when winter comes around and i've never had trouble with my sleds starting when the time comes. its always best to keep the track off of the ground to make sure it doesn't stay wet and such or it will rot. as for the fuel and oil, i store em full, but the "proper" method would be debatable. your owners manual should have a diagram showing you what and where to grease.
Celebrate Your Indepence With A Rocket...Ride Polaris
Celebrate Your Indepence With A Rocket...Ride Polaris