Why do you need an AFR gauge? An AFR gauge can tell you the mixture of air and fuel in the engine. This is roughly 13 parts of air to one part fuel. What is a good fuel to air ratio? It used to be that 12.5:1 was considered the best power ratio, but with improved combustion chambers and hotter ignition systems, the ideal now is around 12.8:1 to 13.2:1.
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