A few have experienced a higher than normal idle on the 07 bikes that climbs higher as time goes by. It will set a code for idle controller (P0505) when this happens which you can find here....

04-07 HD DTC Codes and Activation - Harley Davidson Community (http://www.hdtalking.com/diagnostics_alarms_security_and_fuel_injection_rel ated/728-04_07_hd_dtc_codes_and_activation.html#post3715)

The cause has been found to be the idle stop screw that is located on the throttle body. It should be capped and installed with a locktite from the factory but for some reason, it seems to have been overlooked with the loctite at the factory and vibrates out and hangs the throttle up in a higher than normal idle.
Readjustment to the proper idle speed and an application of locktite will cure this problem.