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Old 08-11-2017, 07:10 AM   #1
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John Deere Z425 2007 hard start


Had this problem last year but learned how to beat on carburetor bowl and start solenoid in bottom of float bowl. Before I ever try to start I look at the in line fuel filter bowl and it is clear full, don't believe this is normal. It will start and run for approximately 8 seconds and die, won't start again until I beat on bowl and start turning engine over and fuel will start moving thru filter. Will start and run OK from then.
Last night it started and ran approximately 1 and 1/2 minutes and died. Fuel filter was half full of fuel like it should be.
Any ideals? thanks
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Old 08-11-2017, 09:18 AM   #2
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Re: John Deere Z425 2007 hard start


Quote:
but learned how to beat on carburetor bowl and start solenoid in bottom of float bowl.
Ayuh,..... Here's a novel idea,....

Rebuild the carb, insteada beatin' on it,.....
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Old 08-15-2017, 06:50 AM   #3
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Re: John Deere Z425 2007 hard start


Well got the carb. off. Took off the air horn with carb.. With air horn in vise and carb. bowl facing up, took off bowl and everything looks fine. Took air horn out of vise and turned upside down several times, float seemed to function properly. I realize just giggling around might of caused it to drop and retract. needle doesn't look bad. Put electric to solenoid and it seems to function right. I will say when I turned carb. right side up the two main jets fell out, should the O-rings on the main jets hold them in place in the emulsion tube?
So what are your thoughts? I will probably change float and needle value while I'm in there.
Thanks
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Old 08-15-2017, 06:58 AM   #4
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Re: John Deere Z425 2007 hard start


Plastic needle valves are notorious for sticking closed. Replace it with a brass needle valve.

Jets falling from O rings doesn't seem like a good plan. Replace if you possibly can find the correct size.
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Old 08-25-2017, 10:04 AM   #5
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Re: John Deere Z425 2007 hard start


Replaced float pin and installed brass needle, all's well. Thanks
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Old 08-25-2017, 09:26 PM   #6
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Re: John Deere Z425 2007 hard start


Score one for @SeniorSitizen
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Old 09-21-2017, 06:04 AM   #7
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Re: John Deere Z425 2007 hard start


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Replaced float pin and installed brass needle, all's well. Thanks
Follow-up question. Yes mower is still running fine. Have been watching clear inline fuel filter, after engine starts you can only see a trace of fuel moving thru it, no amount showing standing in it. Seems to me that the fuel level in this filter while it is running should be approximately 1/2 full of fuel? Thanks
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Old 09-21-2017, 07:24 AM   #8
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Re: John Deere Z425 2007 hard start


This is a borrowed phrase from an unknown individual and being I have an inquiring mind, I've been told, I break his rule sometimes.

"Son, you're worrying about things that don't need to be worried about"
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Old 09-21-2017, 05:09 PM   #9
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Re: John Deere Z425 2007 hard start


Probably not helpful, but early this year my Craftsman mower (with Honda engine) died on me completely. It had been hard to start for a couple of years prior but a shot of starter fluid always got it to fire right up. I assumed it was a fuel delivery issue. Then I bought a spark tester for a few bucks and found that I wasn't getting a spark at all. Ordered a new ignition coil from Amazon and installed it and it runs like new, no starter fluid needed.
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