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Your bike has little caps covering the air adjusting screws on the carburetors. This was started back in the 70s to keep people from adjusting the carbs and committing the most heinous evil dastardly twisted crime in human history.... putting out too much pollution. It is possible that over time one or more of the air screws has turned and your idle air mixture is incorrect. The caps can be CAREFULLY drilled through and removed. The adjustment procedure for the screws may be in the shop manual.
You can mark the position of each screw and then carefully turn them in until they seat gently, counting the turns. They should be between 1 and 1 1/2 turns. You might find one that is way off. But be sure to mark the original positions because getting 4 carbs out of whack will really ruin your whole day.
You can mark the position of each screw and then carefully turn them in until they seat gently, counting the turns. They should be between 1 and 1 1/2 turns. You might find one that is way off. But be sure to mark the original positions because getting 4 carbs out of whack will really ruin your whole day.