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25 hp kawasaki putting out strange rpm's

Discussion in 'Mechanic and Repair' started by matthew horner, Jun 1, 2007.

  1. matthew horner

    matthew horner LawnSite Senior Member
    Posts: 696

    My Kawasaki motor on my Hustler super z is (both under load and no load) is running strange. It will go from one rpm to another, as if it is starving for fuel. It has a new carb, and new fuel filter as of a couple of months ago. The range it fluctuates in is withing 300 or so rpm's ,with no input from me. I haven't detected a trend.

    Any ideas?

    Thanks to all.
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    Try this; While it's fluctuating start applying the choke SLOWLY and see it it smooths out. If it does then you most likely have a piece of trash in the carb.

    Even though the carb. is recently new it doesn't take but one full-up to contaminate the fuel system. Clean the carb, Check/clean tank, Flush the lines and replace the filter again.
  3. petez

    petez LawnSite Member
    Posts: 9

    Or the bolts holding the carb to the engine came loose causing a lean, rich condition as it vibrates.
  4. matthew horner

    matthew horner LawnSite Senior Member
    Posts: 696

    Great suggestions both. I'll check them, thanks so much.


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