jd420 pics

General help and support for your Lindeman through 2010 John Deere crawler
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dtoots1
350 crawler
350 crawler
Posts: 1266
Joined: Fri Nov 30, 2012 8:54 am
Location: akron, ohio

Re: jd420 pics

Post by dtoots1 » Mon Oct 06, 2025 6:30 pm

Not one that i like..

Still wont start .... Since i re=hosed the blown one...i think i may have hooked up my ground ass backwards...negative ground ...and put my 12 volt jump box on it....suspect i may have fried my ..voltage regulator...however...i do get spark at the plug and with proper ground etc...ground (+) now at the starter mount bolts and negative to starter connection....my NEW 6 volt 865CCA...doesnt want to really kick it over....kinda makes me think i do not have a good ground...since before all the other crap....my old 6 volt battery did kick it over after the rebuild..when it had a good charge

so if i have spark at the plug is it possible my voltage regulator causing a problem??
Battery charge at 6.23 and better..last check

obviously i should have proper compression
have spark
and have good fuel....
i did clean out the sediment bowl....tho possible maybe plugged fuel filter...tho seems my carb had plenty..also new plugs in.

Jim B
350 crawler
350 crawler
Posts: 2442
Joined: Sun Nov 05, 2017 11:36 am
Location: western Maine

Re: jd420 pics

Post by Jim B » Tue Oct 07, 2025 5:43 am

The voltage regulator should not keep it from starting. Take the wire off the generator armature terminal, that should isolate the regulator if it is bad. I would say unhook the battery wire from the regulator, but I am not sure if the switch is tied to the regulator for power without digging out a wiring diagram.

You can check fuel flow through the carb by taking a container (a pint or larger) and seeing how fast gas comes out the carb bowl drain. With the container under the drain, pull the drain plug out. You will get a rush of gas as the bowl empties. You want to time how long it takes to get a pint of gas from the steady flow, after that rush stops. It shouldn't take more than a couple minutes, if it does you may have a restriction somewhere.

Pull #1 plug and with it hooked to the plug wire set it next to its hole. Crank the engine over and see if you see the spark at the plug at the same time it pushes out compression, that will tell you your timing is close.

You might give it a couple shots of oil in the cylinders with a pump oiler if it has been setting a while, the new parts may have dried out and be dragging some.

You had the starter overhauled, correct? Check voltage at the starter switch terminal to ground at the starter with it just setting. Then check it with the engine being cranked over with the starter. what do you get for readings?

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