Re: 4 Blackened Spark Plugs?
Make sure you don't have one of the $125.00 mufflers, they have a baffle in them that is way too restrictive and can cause the plugs to soot up quickly. See if your muffler has mandrel bends or regular exhaust tubing bends, that's the easiest way to tell. You need a good muffler with the mandrel bends.
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