I have 06' EG Std with Carb. SE A/C, SE mufflers and modified CV Carb.
I noticed this weekend suring the Toys for Tots run that when at idle the rpm with surge from 900 to 1200-1300 rpm and then back to 900. Engine will idle at around 900 for a minute and then surge again. This occurs after the bike is warm and the Enricher is off.
Bike has 2000 miles on it, and just noticed this once the temps have been below 40.
When I experienced erratic idle, it was due to an air leak associated with the intake manifold. At one time or the other I found problems with all of the following; manifold to head seals, manifold vacuum hoses, carb to intake manifold seal.