Thank you very much for the reply. I do not have excess oil as far as I can tell. And it is about time for an oil change anyway. Not sure what you mean by smoke, I guess when this tractor runs well I don't even notice exhaust. I guess what I am seeing is excess smoke.
I gave the injector test a shot just now. By loosening the fuel line, two injectors caused a major change in the idle, and basically two did not. With the two that did not, one may have been a slight change in the idle. But nothing like the two that did change the idle. For the two that changed the idle, there was almost no fuel leaking and the idle changed a lot. Just a small turn away from snug caused a major change in idle. For the two that I loosened that did not change the idle, there was fuel squirting pretty well.
How can two injectors go bad all of a sudden?
Thanks again for your help, and also everyone else that responded so far.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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