"Someone suggested coils so I replaced that as old one was due for change."
(I'd better not comment on that.)
Two things...
1.) Check for spark cold with and adjustable gap spark tester and note how far the spark will jump, then check again when it's screwing up.
2.) IF you can do this safely, with the engine cold, with a suitable container in hand, remove the bowl drain plug from the carburetor.
There should be a fast flow of gas as the float bowl empties, than a slower, but steady flow as the float drops and the inlet valve opens and fuel from the tank flows through the carburetor inlet valve. The flow has to be adequate to sustain the engine under load.
(I don't think this tractor has a fuel pump, if it does, post back for more details.)
Also, does your specific carburetor have an electric shutoff solenoid on the main jet?
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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