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17 hp Kawasaki and black smoke

Discussion in 'Mechanic and Repair' started by dfor, Jun 7, 2003.

  1. dfor

    dfor LawnSite Senior Member
    Messages: 829

    I idle it down when going around planting beds. When I go to rev it back up to full throttle it hesitates a little and black smoke comes out. I was thinking that maybe the ignition coils needed adjusting with a feeler gauge. Any suggestions. Thanks.
  2. Old Guy

    Old Guy LawnSite Member
    Messages: 59

    I have exactly the same problem with a 23 hp Kawasaki. Hesitates, throws out black smoke and then runs fine. Pulled the plugs and they were black as the ace of spades. Hope someone has an idea about this.
  3. Hud

    Hud LawnSite Member
    Messages: 63

    I'm assuming this means you're backing off the throttle while mowing. Are the blades engaged when you do this? Is your mower designed to run the blades at anything less than full throttle?

    Both my mowers require the throttle to be kept full open when the blades are engaged. The engines are designed to sustain the load of the blades only at full throttle: they can't take the load at anything less, and anything less, with the blades engaged, is very, very bad for them. With the blades engaged and throttle full open, the operator controls are used to control the speed (movement) of the mower.

    Does your mower operate differently? My 48" hydro is 14 hp if I remember correctly. A bit less than 17 hp, but not that much less. If I used the throttle to control the speed (movement) of the mower with the blades engaged, it wouldn't like it. Is this what you're doing? Just trying to help, and curious to know.:)
  4. dfor

    dfor LawnSite Senior Member
    Messages: 829

    Exactly, that is what I am doing. It never used to do this.
  5. ffemt1271

    ffemt1271 LawnSite Bronze Member
    Messages: 1,285

    the black smoke is a product of incomplete combustion. as you gas on it that sends more fuel and at first it will burn rich , hence the black smoke. the black on the plugs is caused by the same thing. your muffler will eventually clog up with carbon also and make the machine run bad also.
  6. danzig

    danzig LawnSite Member
    Messages: 103

    Had the same problem the solution was to keep the air filter clean.
  7. dfor

    dfor LawnSite Senior Member
    Messages: 829

    I changed the air filter and its fine now. Didn't even look that dirty. Thanks

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