Thanks, CNKS and Dave. I did clean (scrub) the sediment bowl (a well named part). I know it hadn't been cleaned for quite a while, because it had about 1/4" to 3/8" of fine clay settled and "set up" solidly in the bottom (seriously) and I found a small trilobyte fossil between layers of sediment (not seriously). I wasn't aware of the filter inside the carb (thanks again), I'll get that next and plan on a carb kit soon, at which time I will flush the fuel system from tank to carb.
Yes, Dave, I'm in MS, so warming up is no problem. In fact, the tractor cranks right up now w/o choking at all, but with the throttle set at about 1/2 way. The throttle seems "loose" or not adjusted right, because the rpm doesn't increase smoothly/proportionately and the same position runs differently according to if you're increasing or decreasing throttle (seems to lag- sticky internal carb parts?). Also, the tractor will idle well at very low rpm if you slowly work it down all the way, but if you drop to 1/4 throttle from full throttle, it dies. It just seems very "sloppy". When I get the grease cakes off I'll be able to better see what's going on and what can be done from the outside, if anything.
Dave, I thought about the black smoke/rich mixture angle- it seems to indicate to me that the engine is flooding when under a load, right? If the main mix is a fixed jet (as CNKS said), could the wrong jet size have been put in at one time? I'm not familiar w/the governor system, could it be flooding the engine when it kicks in under load? Is that a separate carb circuit? And the black smoke/rich mixture indicates that, no matter how dirty the fuel, lack of fuel doesn't seem to be behind this particular problem (unless the gas was so gritty for so long that it sand-blasted the jet to a larger size). Anyway, at this point, more investigation is called for, and now, armed with new info, I can proceed a bit further.
I know I have a lot of work and tinkering to do to get this old baby up to where I want it and I appreciate you guys taking the time to offer your suggestions and experience. I know it would be much harder to do without your help. Thanks again!
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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