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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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