27 HP Kohler Runs Rough

Discussion in 'Mechanic and Repair' started by DonH, Sep 4, 2011.

  1. DonH

    DonH LawnSite Member
    Posts: 14

    I have a 2005 Dixie Chopper Flatlander with at least 3000hrs. on it, tiny tach went out and I never replaced it so not sure of exact no. of hrs. on it. Started running rough, so we pulled plugs, they looked equally good with no fouling. After running cleaner in the gas with no results we pulled the carb. Took the jets out and float off, blew carb cleaner throughout then soaked it overnite in dip. After all this, we had no change, it still runs rough. We checked compression and have 145# and 160# on the cylinders. What can be the problem here? Engine runs good under power with blades engaged but surges without a load on it, and idle is ragged.:confused:
     
  2. DonH

    DonH LawnSite Member
    Posts: 14

    This is a CV-740-0008
     
  3. rwaters

    rwaters LawnSite Senior Member
    from Online
    Posts: 731

    I would still say it is in the likely the carb. I have not used carb dip in a long time found that a good ultrasonic cleaner works much better, but even then I find I can not rebuild all of the carbs I get. I am also assuming you checked or replaced the air filter.
     
  4. DonH

    DonH LawnSite Member
    Posts: 14

    We did change the air filter...
     
  5. DonH

    DonH LawnSite Member
    Posts: 14

    Should the 15# difference in the compression in the cylinders be of any concern? Thanks for your input.
     
  6. DonH

    DonH LawnSite Member
    Posts: 14

    I'm still having problems with this engine. It does mow well but continues to surge and idle very rough. Also I have another issue. I replaced the ignition switch because it failed. Now the engine won't turn off with the switch. Unplugged the white wire and now the kill switch works but battery doesn't charge, it goes dead.
     
  7. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    You have a tired engine...compression when new was 180 psi.
    A leakdown test may lead you to the surging problem...might be a head gasket.
    Pull the choke a little and see if the engine smooths out...might be a bad intake gasket.
    You probably got the wrong switch when you replaced it...causing other problems.
     
  8. DonH

    DonH LawnSite Member
    Posts: 14

    Posted via Mobile Device
     
  9. DonH

    DonH LawnSite Member
    Posts: 14

    I replaced one of the coils on the flywheel and ordered another ignition switch. New switch installed now but the motor will not crank until I disconnect the white kill switch wire. Also the battery will not charge I'm guessing because the white wire is disconnected. The engine still runs rough until the blades are engaged. Any advice please???
    Posted via Mobile Device
     
  10. Snyder's Lawn Inc

    Snyder's Lawn Inc LawnSite Platinum Member
    Posts: 4,541

    Is you safty switch in your seat works or did you disconnect it
     

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