15hp Johnson burning spark plugs

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  #1  
Old 12-22-09, 04:20 PM
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15hp Johnson burning spark plugs

I have a 15hp Johnson that burned the electrode off of one spark plug. After replacing both plugs the opposite electrode burned up. I checked the wires to make sure they were not crossed. Compression is 90# in both cylinders. Plugs are same type I have used for 3 years.
 
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  #2  
Old 12-22-09, 04:39 PM
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A gas mix that's too lean will do that.
 
  #3  
Old 12-22-09, 05:03 PM
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The fuel mixture is 50:1
 
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