1. Mar 1, 2010 #1
   

   fanofjohnwayne I Love microskiff.com!

   

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

    

   fanofjohnwayne, Mar 1, 2010

   fanofjohnwayne, Mar 1, 2010
3. Mar 2, 2010 #2
   

   Brett > PRO STAFF <

   

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

    

   Brett, Mar 2, 2010

   Brett, Mar 2, 2010
4. 
   
5. Mar 2, 2010 #3
   

   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]

    

   noeettica, Mar 2, 2010

   noeettica, Mar 2, 2010
6. Mar 2, 2010 #4
   

   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

    

   Frank_Sebastian, Mar 2, 2010

   Frank_Sebastian, Mar 2, 2010

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