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18hp Kohler dieseling

Discussion in 'Lawn Mowing' started by stpamo, Feb 25, 2004.

  1. stpamo

    stpamo LawnSite Member
    Messages: 13

    We have a 2003 Walker. It has a 18hp Kohler. The engine provides plenty of power but even since the very first day it will frequently diesel after I shut it down. I talked to the dealer and he recommended letting it idle on the trailer for 15 to 45 seconds after use before shutting it down. That does not help either. It is a newer engine for Kohler but haven't they been around long enough to eliminate goofy things like backfires and dieseling. Anybody else have this problem with their 18hp Kohler V-Twin. Thanks.:p
  2. tigger

    tigger LawnSite Member
    Messages: 9

    That engine has a fuel shut off solenoid that should stop any backfireing or running on. Have your dealer check that.
  3. pjslawncare/landscap

    pjslawncare/landscap LawnSite Bronze Member
    Messages: 1,410

    May try going to colder spark plugs & see if that fixes it
  4. edward hedrick

    edward hedrick LawnSite Senior Member
    Messages: 871

    I have a 20 Koh on Walker. give it a quick burst of throttle then

    shut off. Try lfting the box to let out more heat. ed
  5. greensideup

    greensideup LawnSite Member
    Messages: 63

    Also, try lowering the idle just a bit. This helped on my 14 kohler. Scott
  6. Mowing Freak

    Mowing Freak LawnSite Senior Member
    from S.E. Ks
    Messages: 459

    Just like edward said, just throttle up to about half throttle or faster then turn off key. Kohler even says to do this. I have to do it on my walker 20hp kohlers too.
  7. stpamo

    stpamo LawnSite Member
    Messages: 13

    Thanks for reply guys. I will try idleling at just below half throttle and see if that works.:)

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