Posted by JD Seller on July 02, 2016 at 21:09:21 from (208.126.198.123):
Well I am just about to admit to surrender on this darn JD 4020 gas. I have been using it this week. Nothing heavy just general barn yard type of stuff. It has been running great. Kind of nice to use.
So this morning I needed to go over to an out of town land lords place and do some bush hogging for him. So I decided to take the JD 4020 gas as it also has a loader on it and some times there is brush that needs shoved out of the way. We worked all morning and it ran great. Took throttle and ran smooth. At lunch time the landlord's wife had some sandwiches made for us. So I shut the tractor off to eat lunch and I also wanted to adjust the clutch free travel as it was a little too tight. Went to restart the tractor and it just about did not start. Just about cranked the batteries dead before it started. As soon as it did start it was missing. You had to give it throttle real slow or it would start to stumble and backfire. I tried to identify if it was one cylinder missing. It is not. The plugs are not black with carbon, they are white. I fooled with it for a short while and finally had him run me home. I loaded up the JD 6400 on the trailer and went an finished the mowing for him.
After I was all done and had hauled the JD 6400 home, the JD 4020 gas started right up when I went to load it on the trailer. It misses bad enough it will not pull itself in road gear. I let it run while I hauled it home. When I got home it was running a little better and would take throttle but it still has a random miss fire. I fooled with it for an hour or two this evening. I am pretty sure it is an ignition problem. I am leaning towards a bad coil. It has been switched over to an electronic system. It has one of those yellow coils on it. Do any of you know if I have to use the electronic ignition manufacture's coil??? can I just use a regular coil?? The reason I am asking I do not want to harm the electronic system with the wrong coil but I am not sure that the coil is the trouble. It is missing under load when trying to increase RPMs. Everything else check out. Plugs are good, wires are good, tried another known good distributor cap, Compression test and leak down test both show the motor as being good. So it just about has to be the coil or the trigger assembly.
If any of you have a better idea I am very open to subjections on this thing.
P.S. Checked the valve setting last week before tearing into the carburetor.
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