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Tractor Talk Discussion Forum

Re: I'm looking for a 4010/4020 gas engine

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Jon Hagen

02-17-2013 13:57:45
69.26.17.61



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I put a 105 combine engine in my 4020 about 15 years ago. Excellent running 2500 hr engine for $800. It has served me well since adding a powerful electronic ignition and getting rid of that rerdiculous oversize stock carb and replaced it with a smaller one from a 283 Minni Mo. No more smoke,Hard starting, fouled plugs or spitting, uses less fuel and much better low to mid rpm performance.
They also crank much better if you replace the way undersize 10MT starter with a twice as powerful 20MT.


Those engines are harder to find now, too old for most salvage yards and ones parked in the tree row for 10 years are mostly rusted up.

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Bman

02-17-2013 17:05:09
173.18.52.156



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 Re: I'm looking for a 4010/4020 gas engine in reply to Jon Hagen, 02-17-2013 13:57:45  
So what carburetor did you use to replace the stock carburetor?



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Jon Hagen

02-17-2013 17:17:58
69.26.17.61



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 Re: I'm looking for a 4010/4020 gas engine in reply to Bman, 02-17-2013 17:05:09  
One from a MM 283 engine in a model "U" tractor.
It needs a little die grinder work to fit the wider spaced mounting studs of the JD manifold and modify the throttle arm to match the JD linkage. The choke cable and air cleaner tube fits right up and fuel line adapts easily.
Makes a whole new tractor out of them once you get rid of that stinking big vacuum accelerator pump carb.



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Fixerupper

02-18-2013 10:51:39
100.42.82.30



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 Re: I'm looking for a 4010/4020 gas engine in reply to Jon Hagen, 02-17-2013 17:17:58  
Jon, I have to sympathetically chuckle about the carb. On my 105 I finally plugged the vacuum hole that works the accelerator pump. Fuel economy was MUCH better and it idled fine. Downfall to doing this was I had to open the throttle very slowly. I'll remember your suggestion about the Minnie Mo carb. The combine is gone now but I still have the engine. Jim



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Jon Hagen

02-18-2013 14:10:26
69.26.17.61



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 Re: I'm looking for a 4010/4020 gas engine in reply to Fixerupper, 02-18-2013 10:51:39  
I suspect JD used that overly big carb to maximize full rmp power, but it sure messed up the part throttle performance. Being most 4010-4020 gas tractors now never see much if any full power work, the smaller carb makes them a much nicer performing tractor.
I have not put mine on a dinamometer with the slaller carb, but I know it handles a 13X61 grain auger just fine in damp wheat. That is about a 100 hp load, so If it lost any power, it is not much.

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Bman

02-17-2013 17:29:20
173.18.52.156



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 Re: I'm looking for a 4010/4020 gas engine in reply to Jon Hagen, 02-17-2013 17:17:58  
Thanks



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