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  1. B

    Black Spark Plugs - Hotter plugs needed?

    The mixture screw only adjusts the idle circuit. The main circuit is metered through jets or a combination of jets and rods depending on the carb. These are almost always hard parts that can be replaced for adjustment. Generally if the carb ran OK before, these should not need adjusting...
  2. B

    Black Spark Plugs - Hotter plugs needed?

    Dry sooty black plugs are an indication of running rich. Hotter plugs are simply bandaiding the problem.
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