23 HP Kohler tries to run after turn off

Discussion in 'Mechanic and Repair' started by mowZ06, May 26, 2012.

  1. mowZ06

    mowZ06 LawnSite Member
    from Ohio
    Posts: 248

    What causes this ? Kohler 23hp on my Lazer 60" has about 900 hours on it. I have to let it sit and idle to keep it from doing this and still runs sometimes after I kill it. The longer it is ran and the hotter it gets seems to make it worse. I heard some where that kohlers like to be turned off on high idle ? This does not sound right . I think it is referrred to has dieseling. Anyone else have this problem. It does seem to idle a little high.
     
  2. pugs

    pugs LawnSite Gold Member
    Posts: 3,023

    Look in your owners manual. Probably will tell you to shut the engine off at above half throttle.
     
  3. Michael2000

    Michael2000 LawnSite Member
    Posts: 12

    That is definitely dieseling. Several things can cause this:

    1) Engine running too hot (check cooling system)
    2) Idle too lean (check idle mixture)
    3) Excessive carbon buildup in the head (may have to remove head to clean, sometimes running at full throttle at high load and speed for a period will clean it out)
    4) Spark plug with too high a heat range (be sure correct plug type used)
    5) Idle speed too high (lower idle speed)

    Michael
     
  4. mowZ06

    mowZ06 LawnSite Member
    from Ohio
    Posts: 248

    I tried yesterday after mowing a large yard on a very hot day turning it off at half throttle and it stopped with no dieseling or backfire. Now if I did that with my 23 kaw it would probably split the muffler in half from a backfire.
     
  5. Darryl G

    Darryl G LawnSite Fanatic
    Posts: 8,033

    Yeah, Kawisaki engines don't want to start and Kohlers don't want to stop.
     
  6. dahammer

    dahammer LawnSite Member
    Posts: 227

    :laughing:
     
  7. cbegap

    cbegap LawnSite Member
    Posts: 141

    I would also check the fuel cut-off solenoid. You should here a click from the carb when you turn the key to the start position before you engage the starter. It is supposed to cut the fuel going into the jets after spark is cut and the engine is coming to rest while there is vacuum in the carb, preventing it from drawing more fuel, accumulating and then backfiring.
     
  8. VegetiveSteam

    VegetiveSteam LawnSite Senior Member
    Posts: 297

    The great thing about these types of forums is you get a lot of opinions from many different people. The bad thing about these types of forums is you get a lot of opinions from many different people. You shut your engine off at a higher RPM (as you should) and the problem went away. Problems solved. I wouldn't waste anymore time checking anything. Any Kohler engine with a fuel shut off solenoid on it should be shut off at half to full throttle in order for the system to perform correctly. Shut it off at idle and it will probably run on or afterbang all the time.
     
  9. Darryl G

    Darryl G LawnSite Fanatic
    Posts: 8,033

    The funny thing is that a lot of the "experts" on this forum were cutting neighbor's lawns with dad's lawn tractor pulling a wagon down the sidewalk 2 months ago. Now they know everything!!!!
     
  10. herler

    herler LawnSite Fanatic
    Posts: 5,144

    It may just need a thorough cleaning as well, dirt gets up in the engine and the fins can cause heat build up as well, what you are getting is a HOT engine spontaneously self- igniting left-over fuel without need of a spark, why in some necks it's called dieseling when just the heat and compression is enough for combustion.
     

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