Exmark Engine Run On

Discussion in 'Mechanic and Repair' started by lawnoasis, Jul 16, 2008.

  1. lawnoasis

    lawnoasis LawnSite Member
    from Omaha
    Posts: 16

    I have an eight yr old exmark 60"ZTR with 2500+ hrs on it, I let it idle for 2 mins or so before I shut it off, but it continues to run on after that. Could this be anything other than carbon deposits on the piston heads? What's the best product out there for cleaning fuel deposits? Thanks.
     
  2. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,104


    What do you mean by "run on"? Do you have to pull the plug wire to shut it down or does it have a delay before it shuts down and how does it sound when it does shut down. Need a little more to go on.
     
  3. lawnoasis

    lawnoasis LawnSite Member
    from Omaha
    Posts: 16

    It can run for 2-5 secs after I shut it off, (rough diesling) It will eventually stop on its own. Thanks.
     
  4. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,104

    Is the fuel solenoid working? Is the kill switch working? I have seen engine where the kill switch stopped working and when the switch shut off power to the fuel solenoid it took the engine a few seconds to run the last bit of fuel out of the carb pick up tube. Try this. Hook a inline spark tester on the spark plug. Start the engine. Watch the tester. Does the tester stop as soon as you the switch or does it keep firing until the engine stops?
     
  5. chesterlawn

    chesterlawn LawnSite Senior Member
    Posts: 708

    After you are done cutting, don"t just let it idle keep it at 1/2 throttle for about 30 seconds then turn the key off.
     
  6. lawnoasis

    lawnoasis LawnSite Member
    from Omaha
    Posts: 16

    Thanks chester, I'll try that. I did replace the original ignition switch today to no avail. Starts great, runs great. Don't know why it's doing this lately. It does it about 80% of the time usually after long hot runs.
     
  7. fixer67

    fixer67 LawnSite Silver Member
    Posts: 2,104

    Hook a inline spark tester up to the spark plug. See if it still has spark after the switch is turned off. IF it does then it is a grounding problem in the kill circuit. I have seen coils go bad by losing the ground part of the kill circuit when they get hot.
     
  8. 2stroke

    2stroke LawnSite Senior Member
    Posts: 260

    turn the idle down.
     

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