I assume it WAS running good at one point - what, if anything was changed between then and now?
Any "fixes" done? New parts installed? adjustments made?
In the unlikely but free to test category - make sure the brakes are off. Tow it slowly and see if they're working ok - and not seized up. While doing that might as well put it in gear with clutch in - make sure there's not something weird going on in the drive train, putting the engine under stress.
Assuming that works - my first guess would be that perhaps it's running a too lean. No harm in richening it up to test. (or perhpas already too rich and needs to be leaned out - but i'd guess the other way around)
Then I'd check the spark. Not all sparks are created equal - make sure you're getting a solid 1/4" blue spark. on each wire.
Try running it choked - see if that makes a difference - if so you know it's fuel flow relate.
I'd also think about the governor. Perhaps it's not opening the throttle (enough) when under load.
After that I'd start wondering about ignition timing.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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