diagnose

On another forum I am on we have been discussing AI. I tested GROKs response to this question. I have a Yanmar diesel tractor. It started up normally but after I drove it 10 ft, it started putting out black soot. Where should I look first to fix it. When your Yanmar diesel tractor starts...

Looking at picking this up at auction. Anyone have any idea what is happening in reverse on this video? Do you hear that 'grinding'? Check it out around 18 seconds mark. Thanks!

Its been like this a few years, can't do much with it, A few years ago it was overheating when bush-hogging, and its been kinda just started and moved here and there while I think of how to fix it over the past couple years. Thought it might be wires, changed them, made it better but still an...