Fouling Plugs

Discussion in 'Outboard Maintenance' started by fanofjohnwayne, Mar 1, 2010.

  1. fanofjohnwayne

    fanofjohnwayne I Love microskiff.com!

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    My 1990 Yamaha 9.9 2 stroke keeps fouling plugs. What causes that?
     
  2. Brett

    Brett > PRO STAFF <

    http://www.dansmc.com/spark_plugs/spark_plugs_catalog.html
     

  3. noeettica

    noeettica Well-Known Member

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    try different oils ... and only run Real fresh gas ... Less than a week old ...

    ask me how i Know LOL [smiley=fun_84.gif]
     
  4. Frank_Sebastian

    Frank_Sebastian Well-Known Member

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    If you are using a "hotter" plug try going back to the standard one recommended for your engine

    Best regards,
    Frank_S