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Well two weeks ago was running my 2N for 5 hours with the mercury at -20 F. 1. Like others say gotta let it warm up (5 to 10 minutes hopefully partially sheltered from the wind. I stick the back end of mine just far enough out of the garage to allow for the exhaust to escape 2. Running Rough (May be air not getting through the oil bath air cleaner) My dad (Retired Farmer) suggests a switch to Lite transmission fluid for the oil bath in the winter, I put 0 W 30 oil in mine, and once I thawed out the ice cube I found in the mesh screen above the oil bath it ran much smoother.. Had the tractor outside with enough blowing snow I guess to cause a bunch of water to condense and freeze in the air intake system. Running in the very cold temps I'll notice that my tractor will start to surge and lose power as the carb begins to ice... If I stop the tractor with the Carb out of the wind and let it run at a fast idle for 10 or 15 minutes I'll get enough thermal transfer off of the block heat to thaw er out for some more running time ... If you don't have it, I think that Ford actually had a fan which ran in the reverse direction and draws air from the radiator and pulls it back over the engine for winter, rather than trying draw the air off the engine, and push it out through the radiator for summer cooling ... Might want to try and find a winter fan at a swap meet.
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