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25hp kawasaki misfiring need help

Discussion in 'Hustler Turf Equip (Archived)' started by Volkilmer, Jul 13, 2006.

  1. Volkilmer

    Volkilmer LawnSite Member
    Posts: 12

    I have replaced the fuel filter & fuel lines,cleaned the carb & checked for water in the gas. The air filter is clean & the plugs look fine except for being black from the flooding. the mower only has 79hrs on it. any help would be appreciated.
  2. mowerconsultant

    mowerconsultant LawnSite Fanatic
    Male, from Syracuse, NY
    Posts: 9,761

    If your plugs are black, this means your engine is running rich, as in to much fuel, have you removed the air filter just to see if it smooths out when you have it parked? does it misfire all the time or only from time to time when driving the mower?
    In some cases the air filter may look ok, but it may be plugged.
    How old is your mower? what is the serial #? e-mail it to me if you don't want to post it here.

  3. Mowingman

    Mowingman LawnSite Platinum Member
    from Texas
    Posts: 4,664

    Since it is a Kawasaki engine, you also need to have the coils checked. One or the other may be operating improperly. We see a lot of coil problems on all types of Kawasaki twin cyl. engines. In fact, the Kawasaki engines have a reputation for coil problems.
  4. Volkilmer

    Volkilmer LawnSite Member
    Posts: 12

    Changed the spark plugs today & now it runs fine. I was wondering if it had a bad coil, would replacing the plugs make it run better for a while or if it had a bad coil would changing the plugs not work at all.
  5. Accu-cut Lawn Care

    Accu-cut Lawn Care LawnSite Bronze Member
    Posts: 1,206

    Sounds crazy, but 92 octane made my 23 kawi do that... Switched back to 87 and all is good. check your air filter. If all else fails-it could need a valve adjustment.
  6. mowerconsultant

    mowerconsultant LawnSite Fanatic
    Male, from Syracuse, NY
    Posts: 9,761

    The above posts are all good points, I would still check the air filter, if it is plugged it will cause the engine to run rich and foul the plugs.

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