Removing carbon from heads and pistons.
Surely this is RV related since it is cutting into my recreational time. :h My 2 cyl opposed Briggs in the lawn tractor has progressively gotten noisier. It was knocking sort of like the same musi...
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I'd tune the carb so you have the right fuel /air ratio, so you don't get carbon buildup in the first place... a sign of a carb set too rich.
