If you shut the bike off when the idle is high the ECM will remember the idle speed and the idle speed will be high from then on. To reset the idle speed to normal you need to cycle the ignition on/off 5 or 6 times. If the idle speed fluctuates when the engine is running you may have a vacuum leak and the most common place for a vacuum leak is the vacuum stem on top of the throttle body, there is a rubber cap over that stem and that cap could be missing or cracked which will cause the vacuum leak.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.