Well, after looking at an IPL (2001-2006) I saw the part you were talking about. Took the carb off. That was not real easy. I learned the tricks, so next time will be easy. (I should write it down so I won't have to learn all over again) After it was off I found out they aren't built like that now. A pair of pliers did get the stupid limiter cap off. It has a lip that holds on pretty tight.
I set the carb by ear. It doesn't burble like the old saws did, just kinda dogs when it is to rich. With the rev limiting coil you can't judge where the lean zone is either. I put it just out of the dogging rich zone and ran a tank through and the plug electrode (flat one, that was on the white side) has tanned up a little already. Should probably buy a tach. The plug from the factory was way too tight. The carb mounting screws were a little on the loose side. Hopefully won't have to mess with it for a while.