Many of the thermostat housings on those tractors are rusted so the coolant goes right on past the thermostat. Even when new there was not a positive seal as the tube slides up into the bored hole in housing. There is not enough material in there to install a seal on the gas engines but I have had it done on some diesel engines like 450 diesel. I have fashioned my own ideas on the old gas burners to ake the thermostat actually hole the coolant back. Also, like Jim says, bypass has a lot to do with them not warming up but all of mine do warm up even without the bypass restricted. Far as black smoke at idle, if the adjustments don't take care of it you most likely have wrong or damaged idle jet in carb. Had a guy bring a 300 carb into me last year that someone had been drilling things out and drilled the wrong jet for what he intended to happen.
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Today's Featured Article - Storing Your Tractor - by Staff. If your tractor is going to be stored for any length of time, a few precautionary measures are helpful in preserving various parts, also in avoiding future difficulty. Store tractor under cover. If impossible to place tractor under cover, be sure to cover air stack and exhaust pipe. Drain radiator and engine block. To avoid gum content collections, drain both fuel tanks and carburetor. Leave radiator and fuel caps slightly loose to protect gaskets. Block tractor up to remove weight from tires and to keep tires from contact with moist floor.
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