I know exactly what you are talking about JD. I ran one occasionally when worked for Hiniker Co. They had one for a yard tractor. This was before there was ethanol gas but that thing acted the same as you are describing. I never tried to get it running any better nor did anyone else. I just figured it was abused and neglected and maybe needed plugs or points or both. Just a general tuneup. Flash forward to a couple years ago when I was at my neighbors who has a 4020 gas that he said acted like that. I had just repaired his feed grinder and I said lets grind a batch of feed and make sure the grinder works ok. He put the 4020 on it and wound it up to grind corn. I said is that the way this thing always runs? Yep, that's the way it always ran since Dad bought it 40 yrs. ago. Just would not throttle up unless you did it real slow. So I adjust the carb. to where it throttles up real quick and is running under load real good. He was amazed that it was such a simple fix. I see him a couple weeks later and ask if the 4020 still running ok. NO, Loads up at idle and fouls the plugs. Lean carb back down and now you have the hesitance again. So he is getting serious about getting that thing to run right and runs it up to the local repair shop who is experienced working on older JD. Says that's the way they all ran. Only fix is to put different brand carb. on. Forgive me but I don't know what brand they changed it to or from. Long story short, when he got it back with new carb. it ran just as poorly as it did in the beginning. I talked to another friend then who's Dad bought a 4010 gas brand new and he said their's never did run right since new and they have tried 3 different carbs on their's. So I'm convinced the problem is not with carberation as many here seem to think. I think it must be a design flaw in the manifold or valves or total engine design. I think only solution, if you can't live with it is to get rid of it.
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