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Mower runs low on Rpm's and then speeds up

Discussion in 'Lawn Mowing' started by VnDrWLawnCare, Sep 10, 2002.

  1. VnDrWLawnCare

    VnDrWLawnCare LawnSite Member
    Messages: 208

    Hello, I have a 17hp Kaw with 380 hours on it. I started it up and it seemed to only be running on 1 cylinder. So i put new plugs in it and that did not seem to help. So i thought that i would try to run it as is. With the blades engaged and full throtle, it will only turn 2600 Rpm's. After a few minutes though it will suddenly go up to 3500 Rpm's without doing anything. I thought that it could be a bad spark plug wire, however i am not sure. If anyone has any suggestions please let me know. Thanks for you assistance.:(
  2. Floridalandcare

    Floridalandcare LawnSite Senior Member
    from Tampa
    Messages: 314

    Could be a bad coil .
  3. thfireman

    thfireman LawnSite Senior Member
    Messages: 541

    Florida has it right, replace the coil.:(
  4. awm

    awm LawnSite Gold Member
    Messages: 3,354

    dont know if this might be a factor but
    my lazers seat switch and engageblade switch bothe just cut it to one cylinder. i wasnt always thatway. but its possible u have a safety switch causin this.. in other wds faulty.
  5. dfor

    dfor LawnSite Senior Member
    Messages: 822

    Sounds like a bad coil. My 17 hp Kawasaki has gone through a few coils in about 2.5 years. I pull the spark plug wire and if it still runs the same, well then that is the bad coil. I asked my dealer why I was going through so many coils (every 6 -9 months or so. He called a service technician at Kawasaki. They said to do the same, except to replace the other coil. Makes absolutely no sense to me, but next time I'll give it a try and see what happens.
  6. jrodgers

    jrodgers LawnSite Member
    Messages: 227

    My 15's and 17's have had bad coils with relativly low hours.
  7. TJLC

    TJLC LawnSite Bronze Member
    Messages: 1,308

    That is the EXACT same thing my 18hp Kohler was doing. Dealer replaced the coils and it runs like new again. I do recall before I took it in for repair I could pull one of the plug wires off while it was acting up and there was no change.
  8. awm

    awm LawnSite Gold Member
    Messages: 3,354

    good to know about this coil thing. never had that problem,but ill recognise it when i see it now.
  9. D&V

    D&V LawnSite Member
    Messages: 24

    How much does this usually cost to fix? I am having the same problem on my 19 horse Kaw.
  10. jrodgers

    jrodgers LawnSite Member
    Messages: 227

    Mine was under warantee so I dont know. If I were to guess I would say somewhere in the $40 to $50 range

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