JD 727 zero turn running rough
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    KPH
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    JD 727 zero turn running rough

    Hello I have a 2003 727 Z Track lawn mower with approximately 650 hrs on it, and it has been running increasingly rough, trying to make it through mowing season 😃. I have replaced fuel filter and loosened gas cap, no change. I have pulled plugs and replaced but did not gap them (no gauge) . I noticed one plug nice and dry BUT the other one quite wet! And in general dirtier looking. No noticeable oil leaks on outside of engine from blown gasket for instance. It’s sputtering when I give it throttle and doesn’t seem to get up to full RPM when I’m mowing, no real symptoms at idle. Kind of surging and sputtering in general and getting worse when mowing! What do you guys suggest I check next?
    Thanks
    Kevin
    Thanks
    Kevin
    2006 CT332
    1989 Jd 770
    2003 727 Z track mower

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    IndianaJim's Avatar
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    If youve got a wet plug after running, that plug is most likely not firing.
    Check your coil or coils.
    Jeff B likes this.
    Jim B.

    318, 49 Thrower, 2 80 Carts, 17AT cart, 54 Blade, 12" Brinly Plow, 30 Hydraulic Tiller w/extension & Briney 3-Pt hitch, 50 deck w/JRCO Cart Bagger.
    2025R, 120R loader w/Kens Bolt On Hooks, 260B backhoe w/8" & 16" buckets, Titan 36" forks, Imatch hitch, Weight Bracket/Hitch.

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    xcopterdoc's Avatar
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    As Jim said, check for actual spark on each cylinder. If no spark it's likely the coil. If so, replace both at the same time.
    If you have spark on both cylinders but have low power unplug each spark plug wire and see which cylinder is dead. A common failure on these engines is a valve train issue. Valves will stick, then bend a push rod. Once you have identified the dead cylinder remove the valve cover and have a look. In extreme cases the valve guide will move in the cylinder head, bend a push rod. Sticking valves and pulled valve guides are caused by overheating and/or bad gas which causes the valve stem to sieze in the guide.
    Let us know what you find.

    Sent from my LGL52VL using Tapatalk
    Drifterbike likes this.

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    KPH
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    Thanks for your suggestions, I alternately disconnected sparks plugs and engine kept running no matter which side was unplugged . Does this eliminate coil packs? Or could they just be weak, I don’t know how to test for that. Your suggestions? As I said at idle everything fine, when I increase throttle it sputters and won’t achieve full RPM even with no load, mowing deck not engaged.
    Thanks
    Kevin
    Thanks
    Kevin
    2006 CT332
    1989 Jd 770
    2003 727 Z track mower

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    IndianaJim's Avatar
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    What engine is on it?

    A wet plug on one side indicates a problem, but what problem is the issue here. Its odd that youd have one wet plug and one not, but both firing. Can you tell if its fuel or oil?
    It could be a weak coil, but (Im not positive on this) there should be a test procedure. Knowing what engine was in it would help narrow that process down.
    If its fuel, it could just be running very rich, which could be a carb/fuel issue.

    As to the coils again, knowing the engine would help because if that engine has one coil firing two plugs, by disconnecting one, you will get a stronger spark to the other, in theory at least. There are automobile engines that fire pairs of plugs at the same time. One coincides with the power stroke on one, but not the other, so it has no effect on the one without fuel. Generally these are waste spark systems, and without the other plug attached, neither will fire, but there are all kinds of odd things going on in the world of engine ignition systems.
    Last edited by IndianaJim; 09-15-2018 at 01:31 PM.
    Jim B.

    318, 49 Thrower, 2 80 Carts, 17AT cart, 54 Blade, 12" Brinly Plow, 30 Hydraulic Tiller w/extension & Briney 3-Pt hitch, 50 deck w/JRCO Cart Bagger.
    2025R, 120R loader w/Kens Bolt On Hooks, 260B backhoe w/8" & 16" buckets, Titan 36" forks, Imatch hitch, Weight Bracket/Hitch.

    Exmark Lazer Z HP 52"
    Husqvarna 550XP, 562XP, 55 Rancher

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    If it was my mower, I would remove the carburetor and install a new carburetor kit. A wet spark plug give evidence that the rings on that cylinder is going bad... probably the oil and compression rings all at once, or it could be the valve seals in the head needs replacing.

    However, I would first pour a can of Seafoam in the tank and run it full throttle for couple hours of mowing. That would clean out the crud in the carburetor.

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    KPH
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    The engine is a Kawasaki, family ID 2KAX86762CA
    E/NO FH 680VB09716
    Code FH 680V B516
    Date of manufacture 1002

    Let me know if any other questions
    Thanks
    Kevin
    2006 CT332
    1989 Jd 770
    2003 727 Z track mower

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    KPH
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    Also is it normal for fuel filter to have only this much fuel in it? Or should it be more full? Thanks again
    Attached Thumbnails Attached Thumbnails 8EB95551-AA3F-4209-9A36-DED4977428B7_1537197302040.jpeg  
    Thanks
    Kevin
    2006 CT332
    1989 Jd 770
    2003 727 Z track mower

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    BigJim55's Avatar
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    Quote Originally Posted by KPH View Post
    Also is it normal for fuel filter to have only this much fuel in it? Or should it be more full? Thanks again
    my x475 is probably about as full as urs is.
    jim

    2006 2520 mcut, 2004 x475, 1953 model 50, 1985 318-was my Dad's,
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    2018 835R gas model gator-"aka" the Cadillac i say!! 6ft jd snow plow-which already has a dtac out on it. i got just about everything on it i could at the time

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    Quote Originally Posted by KPH View Post
    Also is it normal for fuel filter to have only this much fuel in it? Or should it be more full? Thanks again
    Fuel filters are not a "holding" tank on gas engines. Just there to filter out any particles before they get to the carburetor. Should you see no fuel as you crank the engine, then you should have some concerns.

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