Ah . . . . Winter in Minnesota.
I agree with Scotty, read the Spyder Storage procedures in your Owner's Manual (page 78 of mine).
The big points:
Antifreeze/Coolant
Just as you do with your car, make sure the coolant/anti-freeze is filled. The standard BRP product is rated to -34F. Last year, Minneapolis got down to -20F in January 2009, but your average lows are around Zero.
Battery
A battery tender is a very good idea.
Fuel
Yes, stabilize the fuel. By doing this, it chemically absorbs any water/moisture that is in the fuel system and keeps it from condensing out, gathering on internal metal parts and causing rust to form.
Keep it dry.
For motor cycles and other equipment going into storage for Winter (and even other seasons) water condensation is the biggest problem. As metal (or anything else)cools to the temperatures around it, humidity in the air will condense on it. This is what you see forming on the glass of a cool drink in Summer. In winter, you will see this as frost.
Metal takes longer to warm up, so any humidity in the air will collect on it. So as water melts and evaporates, any cold metal will be collecting the moisture. Given enough contact time and occurrences, the water will react with some of the metals and rust or discolorations will result. This can be unattractive, but on components like the dashboard (which has air vents or slots) the corrosion can destroy wires and circuit boards. On an all weather vehicle like a motorcycle, these components are protected, but they are not impervious to prolonged exposures to dampness.
There is also the problem of water pooling in small cracks and crevasses and going thorough freeze/thaw cycles. This is generally not an issue on motorcycles.
It is best to keep your Spyder dry as you can when in storage. A breathable cover will let moisture escape and keep moisture from falling on it. There are products that collect moisture and small fans and heaters that you can put under the cover. Some people put a shop light on the floor, even this little bit of heat will circulate the air and help move the humidity out of the cover.
Some here have recommended using an oil or wax on the metal parts. That works, like oiling a gun before putting it away, but to be practical, you will not be able to coat all the metal parts of a Spyder.
In general, do the coolant/antifreeze, battery, fuel and keep it as dry as you can. After all, the Spyder is an outdoor vehicle and getting wet will not destroy it. If it is in your garage, remove any snow, slush, ice that falls off your car - that will help keep the humidity down. While Winters generally are less humid than other seasons, the cooling/condensation cycles are more critical for internal systems and exterior metal parts since you are not riding for an extended period of time.
Oh, and it also helps if you put it away clean. Some things are harder to clean off if they have had time to sit - just like the dishes.
Tom
