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"Idle" can mean two things: idle speed, and idle mixture. Both of these are on the carburettor. Idle speed is adjusted via a screw that is on the throttle control cam. Turning this screw will change the RPMs of the machine at idle. The idle mixture changes the amount of gas that flows during idling, and can be changed by a screw inside a round recession on the bottom of the carb.

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Q: How do you adjust idle on a 1998 harley Davidson sportster?
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