You need to keep your fuel and engine warm, wrap aluminum foil around the cooling tower and stick a heat packet in the top of it, then stick a few around the engine and a few around the fuel tank.

[link=http://www.adorama.com/PBPHP1.html?sid=11594200423499016]Air Activated Chemical Hand & Equipment Warmers, Pack of Two.[/link] I think these would be appropriate, they are designed for keeping photography equipment warm when people climb mountains to take pictures, the packets reach 130 deg. F and last 6 hours. Your engine will think it's in Hawaii. 130 degrees sounds like overkill but since it is cold out a lot of the heat will dissipate.

You might want to put a little plastic wrap around the receiver to keep it dry in the snow (if it's snowing).