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John Deere L120 spark plug turned white/engine running rough
| Dave | My 22 hp Briggs and Stratton engine is running rough at high rpm. I checked the spark plugs and one of them is white. I changed the plugs and it still doesn't run properly. The new plug was also turning white. Do I have a head gasket problem? I have checked both the bolts on the intake and on the cylinder head and none were loose. Could it sill be the gasket or should I be looking at something else?
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