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John Deere 425 no spark


Pete Billings's Avatar
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06-13-15, 02:10 PM   #1  
John Deere 425 no spark

I have an older John Deere lawn tractor Model 425 with hydrostat and a 54" deck. It runs a 20 HP 2 cylinder Kawasaki water cooled. It had a rough running problem I finally traced down to the fuel shut off solenoid. The wire was broke off flush with the top. Replaced it and got started but seemed to hunt for fuel once applying a load. Ran like an old push mower when the governor spring would break. Bouncing back and forth.

Now it will crank but no fire. I have a visual spark tester bought from Oriley's. Been fighting this thing for a month now. all safety switches checked out OK. They stop starter from running.

 
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cheese's Avatar
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06-13-15, 08:39 PM   #2  
No spark from either cylinder? How big of a gap is in the spark tester? Have you visually checked at the spark plug for spark?


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06-14-15, 12:05 PM   #3  
I just checked the left bank sitting on the mower side. Will try the other as well but have doubts as not even a pop from it in all the tries. The gap is adjustable and I tried it from around .010 to around .125.

 
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06-14-15, 04:34 PM   #4  
Checked both cylinders and no spark at either. Fuel tank is full and can hear the fuel pump running in the tank.pulled hose above fuel filter turned key on and it pumped a solid stream.

There is a control module down by the frame that when turn key on lights up a green LED.

 
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06-14-15, 05:41 PM   #5  
There are a lot of complicated testing procedures you can do, but usually the problem is caused by the time delay module. As cheap as it is, I'd just put one on. It will probably fix the problem.


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06-14-15, 06:23 PM   #6  
OK that kind of confirms what I had read in other places as well but were other models but ran the same Kawasaki motors. I will come back and tell what happens either way.

 
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06-16-15, 05:56 PM   #7  
Got the module in today and installed. Fired right up. Was still running sorry like hunting for fuel. Fed her some seafoam and was clearing up.

New gremlin. Popped the top fuse on the control board. Tried another samething. Pulled both wiring harnesses off and put in new fuse. Plugged the biggest harness on the right while facing machine. Good. Soon as touched the other to the prongs popped the fuse.

Got ohm meter out and pink with black and solid blue both have a strong reading to ground. No idea where they go other then there is a big loom they go into by the steering sector. With the mower on can't get close to see where from there.

 
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06-17-15, 01:27 AM   #8  
That's a hard thing to trace without a wiring diagram. Here's how I might tackle it: Disconnect all electrical components and leave the harness plugs connected to the switch. Put a new fuse in and test. If it blows, you may have a shorted wire. If it doesn't, start plugging in one component at a time until you find the one that blows the fuse.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

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