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Throttle floats - Kills engine

Discussion in 'Mechanic and Repair' started by cr107, May 26, 2008.

  1. cr107

    cr107 LawnSite Member
    Messages: 5

    Craftsman with 17HP Kohler...Push throttle lever to start, choke closes, starts like a charm. Back throttle off to run position and runs smooth for a few minutes. Then the throttle lever assembly on the side of the engine starts floating back and forth pusing the rod to the carburetor...giving more, then less gas...finaly it just floods it out or something. It never closes the choke during this..just pushes the throttle rod back and forth until she dies...
  2. mountainlake

    mountainlake LawnSite Member
    Messages: 33

    Sound like it's starving for gas after a few minutes, check the fuel filter and the gas tank vent, just loosen the gas cap a little when it starts acting up to check the tank vent. Steve
  3. cr107

    cr107 LawnSite Member
    Messages: 5

    That's what I thought too. Had to be a supply problem. But replaced the filter and took off the cap trying to fix it yesterday. Didn't seem to have any effect.
  4. cr107

    cr107 LawnSite Member
    Messages: 5

    Should mention that it seems to only happen after it's been running for a while...
  5. 44DCNF

    44DCNF LawnSite Bronze Member
    Messages: 1,585

    The hunting your refer to could is sometimes caused by a plugged idle circuit in the carb, or worn linkage. On smaller engines with primer bulbs I have been successful in clearing the carb obstruction by choking the engine while pumping the primer bulb at full throttle, while trying to keep the engine running. You might try some Sea Foam before opening up the carb. Try a search with "governor, hunting" and you should get some better ideas of what to look at. Is there any side play in the throttle shaft or choke shaft?
  6. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Messages: 963

    IF you are getting black smoke, you are getting too much fuel.

    IF NOT, probably not enough.
    Did you use a genuine Kohler filter, designed for that engine??
    What happens if you ease the choke on when the engine is surging?
  7. cr107

    cr107 LawnSite Member
    Messages: 5

    Choking will help a little for a minute or so...but it doesn't stop the surging (hunting) for more than a bit....
  8. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Messages: 963

    Sounds like not enough fuel to the carb then.
    Filter, clogged gas cap vent or weak fuel pump (if equipped) would be what I'd check.
    I've heard of a few Kohlers that had problems with non Kohler fuel filters.

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