Kawasaki Running Rough

Discussion in 'Mechanic and Repair' started by HobieDude, Apr 8, 2014.

  1. HobieDude

    HobieDude LawnSite Member
    from 7b
    Messages: 26

    I need some help diagnosing a rough running Kawasaki FS541V 18 hp with only 150 hours. It runs as if the fuel/air mixture is too rich however there appears to be no carb adjustment. It sputters and pops at full throttle not so bad under load. Changed plugs, emptied carburetor bowl, thinking water in the fuel might be the problem, both plugs seem to be getting spark. Any ideas? Thanks for your help
  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Were the plugs black/sooty looking ?
  3. M&L

    M&L LawnSite Member
    Messages: 245

    The spark plugs can tell you a lot. Posting a pic might get you some better info.
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  4. american dream

    american dream LawnSite Senior Member
    Messages: 317

    Sounds like choke on a little
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  5. HobieDude

    HobieDude LawnSite Member
    from 7b
    Messages: 26

    Yes, the plugs were black and a little sooty
  6. HobieDude

    HobieDude LawnSite Member
    from 7b
    Messages: 26

    Unfortunately, I don't have the plugs and can't take a pic. And yes, it does sound and run like the choke is on but it does not appear to be. Thanks for your input
  7. CorkyE

    CorkyE LawnSite Member
    Messages: 124

    Any restrictions on the air intake side, such as a dirty filter?
  8. herler

    herler LawnSite Fanatic
    Messages: 5,139

    I know you're not forgetting to turn the choke OFF after you get it started.
  9. HobieDude

    HobieDude LawnSite Member
    from 7b
    Messages: 26

    Air filter clean. Emptied the carburetor bowl. Did not appear to be any water. Running some fuel treatment through now with little improvement. Not sure what's going on
  10. craftsmanracer

    craftsmanracer LawnSite Member
    Messages: 79

    There is a fuel/air adjustment on your carb, just gotta find where it is.

    Sometimes there is metal cast over the adjuster screw or a plug because the factory doesnt want people messing with it.

    Make sure your muffler isn't clogged.

    Be careful when you adjust the fuel/air mix! if you go too lean, it will be overheating in no time.

    turn it out in 1/4 turn increments until it runs like it should. It shouldnt be more than 1 tun out if it is already running halfway ok.

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