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15hp Johnson burning spark plugs


bwestbrook's Avatar
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Join Date: Dec 2009
Posts: 30
MS

12-22-09, 04:20 PM   #1  
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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Rick Johnston's Avatar
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Join Date: Apr 2007
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12-22-09, 04:39 PM   #2  
A gas mix that's too lean will do that.

 
bwestbrook's Avatar
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12-22-09, 05:03 PM   #3  
The fuel mixture is 50:1

 
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