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John Deere sx75 spark problems


Rickjeremy's Avatar
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06-16-16, 04:51 PM   #1  
John Deere sx75 spark problems

I have replaced both the coil and ignitor. Will run for 15 or 20 minutes, then shut off. I will let it cool down for a short time and it will start up again. It seems to loose spark? Any ideas on what to do next??

 
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06-16-16, 06:30 PM   #2  
I would start by verifying if it has spark or not immediately after it dies. Are the coil and igniter both OEM Kawasaki parts or aftermarket?


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06-16-16, 09:25 PM   #3  
No spark after it dies. Both parts are oem.

 
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06-16-16, 11:53 PM   #4  
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06-22-16, 03:12 PM   #5  
Both parts resistance meets specs. Any other ideas? Seems like I'm chasing a ghost. Is there a shutoff delay switch?

 
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06-22-16, 04:08 PM   #6  
Have you isolated the ignition circuit from the kill/safety circuit?

 
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06-23-16, 12:24 AM   #7  
I don't think there is a delay switch on that mower. I would do as Marbobj suggested. I think you can unplug a small connector in the white wire near the igniter to isolate the ignition from the mower safety circuit but you won't be able to shut the mower off until you plug it back in.


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06-23-16, 07:12 AM   #8  
Bought a spark tester this morning and the tester indicates I have spark. It flashes when I turn it over. Fuel system problem?

 
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06-23-16, 08:53 AM   #9  
If you see the spark tester flashing and it is flashing very fast the igniter is probably bad, it is firing but at the wrong time. I had one that did that on a Kaw walkbehind mower, replaced it with a Rotary igniter for about $20 and all worked well. Somewhere in the back of my mind I also remember that you must use resistor spark plugs in an engine with the igniters because they don't like the static created with non resistor plugs. Have a good one. Geo

 
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06-23-16, 09:05 AM   #10  
You have spark when you thought you didn't - right after it dies? You have determined this by going to a spark tester where you were using another method of testing for spark? Did you do anything with disconnecting the kill circuit wire that Cheese pointed out?

 
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06-23-16, 01:15 PM   #11  
I found out after speaking with a small engines guy that you can't always see a spark, that's when I bought the tester. I'm learning on the fly here. Also the ignitor is brand new. I haven't disconnected at the ignitor yet. I'll try that next. I did pour a small amount of fuel in the carb and it did fire and run for a bit

 
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06-23-16, 02:46 PM   #12  
Isolating the ignition system would only pertain to no spark at the time of it quitting. You can look for other possibilities.

With it starting on a hand feeding it sounds like fuel issues.

 
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