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13HP Kohler Command going through plugs

Discussion in 'Mechanic and Repair' started by vencops, Aug 22, 2011.

  1. vencops

    vencops LawnSite Bronze Member
    from NC
    Posts: 1,537

    What would make my old (yes, it's old) WB go through so many plugs? I've been through 4, this season. Seems they last less and less time, lately. And, I'm not using the mower any more than I have in the past.

    I put a new air filter on it just last week. I had to install a new plug, today. It didn't have 5 hours on it.

    I've changed the oil and filter, regularly.

    Admittedly, I use this machine in some REALLY rough stuff, occasionally. But, this is just a little absurd (IMO).

    Thanks.
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Which one of these plugs look like yours when you remove it ?


    [​IMG]
     
  3. vencops

    vencops LawnSite Bronze Member
    from NC
    Posts: 1,537

    Probably looks most like the wet fouled.

    I changed the air filter the last time I used it, before today. Today, it wouldn't crank. I tried a little starter fluid, and it didn't fire. I changed the plug (this is typical of how it goes with this unit) and it works, fine.

    The air filter is naturally clean as can be.

    The plug that came out didn't really look bad. If anything, the residue is dark and moist. But, it's not bad looking.
     
  4. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    How much oil does it go through?
    Is your oil level too high?
    You can only get 10-20 years out of a Kohler.
     
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    To add to Slappers questions, What brand/number spark plug are you running ?
     
  6. vencops

    vencops LawnSite Bronze Member
    from NC
    Posts: 1,537

    It's never burnt oil, since I've owned it. I bought it in March of this year. I did change the oil, last week. I'll re-check the level. I put in a "hair" over 1.5qts.

    My dealer checked and double-checked the plugs, when I asked for them. He was aware it takes a shorter or longer (I can't recall) plug...and that the wrong one was bad news.

    I'll check it......

    It's a ChampionRC12YC.
     
  7. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Are you gaping the plug at .040" ?

    You could have a weak/cracked/broken breather reed causing the issue.....
     
  8. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    Unless there's a specific reason for the .040 gap...
    I always gap anything non-2 cycle .030...

    And you can make the gap wider but that's more space the spark has to hurdle.
    Shorter gaps, wider arc.
    Wider gaps, thinner arcs.
    Too wide, no arc.
     
  9. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    I think revised BOOK spec is reason enough.......
     
  10. vencops

    vencops LawnSite Bronze Member
    from NC
    Posts: 1,537

    The info. on gapping for these plugs is all over the board. Seems Chapion suggests .040 and Kohler is either at odds with that.....or, they're behind the times (seems crazy, since they've been making this engine a long time).

    I haven't even been checking the gaps, though. I know that's blasphemous, in this forum. But, no use fibbin' about it.

    I'll get a tester, today. Thanks.
     

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