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  1. #1
    Super Star Member brin's Avatar
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    Default Lawn Tractor won't start after being turned off ?

    I have a 20 HP Murray Lawn Tractor and lately in has backfired when I shut it down and then will not start for a long time after shutting it down. It runs fine up until the shut down and then won't start again. I have checked the air cleaner and it has clean gas. I did not go into the carb since it ran fine and has been running fine. I do the service on my tractors but his has me baffled..I am wondering if it could be the fuel filter...but since it ran fine I kinda doubt that. Any thoughts will be appreciated. Thanks
    Bob

    WORRYING does not take away tomorrow's TROUBLES, it takes away today's PEACE.


    NH - TC-29 , FEL, Bush hog, Bush hog brand finishing mower, Post hole digger, 6' Back blade, sub-soiler, Pallet forks, 20KW PTO Generator , 21 hp Murray Mower
    JD -3020 with FEL and a 16 HP. K-Grow Lawn Tractor (bought from K Mart 1994) and runs great !
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  2. #2
    Elite Member
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    Northwest, WA

    Default Re: Lawn Tractor won't start after being turned off ?

    Any spark ?

    Will it try to run with a shot of starting fluid ?
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  3. #3
    Super Star Member
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    Aug 2001
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    Upper Midwest USA
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    JD 4300, JD X485 JD 4x2 Gator, JD 425, JD455

    Default Re: Lawn Tractor won't start after being turned off ?

    Try to run down why it is backfiring, and you may find out why it is not starting.

    Checked compression? Right after back firing, and then a "long time" later. This may give you a clue as to rings or valves.

  4. #4
    Elite Member zzvyb6's Avatar
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    Dec 2006
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    michigan
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    jd 1070

    Default Re: Lawn Tractor won't start after being turned off ?

    I have a few motors that have been doing the same thing (Honda GS160 on a leaf vac and Yamaha 250 atv). I've associated it with using 15% ethanol fuel. Put a new spark plug in them and they run just fine after that. Go figure....
    There is no "I" in team, but there is a "Me" if you want to jumble it up a bit...

  5. #5
    Veteran Member
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    Jul 2005
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    NH seacoast & Coos County
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    Kioti DK45S

    Default Re: Lawn Tractor won't start after being turned off ?

    Does your engine have a fuel shutoff solenoid (which is supposed to eliminate backfire on shutdown)?
    May also be an exhaust valve adjustment issue, ie lengthen when heated & don't seal enough to allow restart untill cooled. MikeD74T

  6. #6
    Epic Contributor jinman's Avatar
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    Texas - Wise County - Sunset
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    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Lawn Tractor won't start after being turned off ?

    Do you smell gasoline when trying to restart? I'd sure pull a spark plug to see if it is wet as zzvyb6 suggested. Sure sounds like a flooded engine to me. The backfire you are hearing might be because of a flood of fuel on shutdown. It might even indicate that your float valve is not seating properly, especially if you don't have a fuel cutoff solenoid as MikeD74T suggested.
    Jim


  7. #7
    Platinum Member
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    Westminster, Maryland
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    Kubota B7300

    Default Re: Lawn Tractor won't start after being turned off ?

    I have a B&S 14 HP twin, does the same thing after running for a while. I lose the spark whenever the magnito gets hot. It won't happen when it's running, since the air goes past the magnito before cooling the cylinders, but if I shut it off when the engine is HOT, the heat from the cylinders effects the mag and no-spark for 30 or 40 minutes.
    Steve

  8. #8
    Veteran Member
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    N. E. Ohio
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    tc- 29d

    Default Re: Lawn Tractor won't start after being turned off ?

    do you have the model # of the engine; that would help
    dqdave1; tc-29D; woods 7500 bh; 7308 fel, land pride tiller, land pride rake, gill pulverizer, 60"mmm. , bucket forks , MZ16H

  9. #9
    Bronze Member
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    Aug 2009
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    Default Re: Lawn Tractor won't start after being turned off ?

    Not sure it will help on yours but do you let it idle and cool down before shutting it down?

    Topstrap

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