If they are not started on gas, they will nearly always puff smoke on one or more cylinders until warm. Not enough heat in the chamber(s). Start them cold with a missing plug wire to see this happen. Also, a cold cylinder may drown and stay dead until it pools enough fuel to start hydro knocking and try to break something. It's not pretty when it happens.
Injectors may be worn or too light in the break pressure, but dirt is usually not the issue.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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