I find the best thing to do in a case like that is to try choking it while it's having trouble - maybe not fully - play around to see if there's a point where it runs better.
It's an instant test, and you don't even have to get off the tractor.
If it runs better, it's almost certainly a carb problem. And almost certainly a problem of fuel starvation - probably from blockage.
If that doesn't work it doesn't prove anything, but it at least hints that it may not be carb related.
Others have offered good ideas of where to look at other variables, but just wanted to throw this out there as it could help you in the future.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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