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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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