I just replaced the vacuum petcock on my 2002 with a free flow and it is great. That vacuum petcock can (and will eventually) cause you problems that can be hard to diagnose and/or distinguish from choke or carb issues.
Because of my bad vacuum petcock, I replaced the thumb choke with the choke eliminator that screws directly into the carb. As it turned out the choke wasnt the problem but what a great farkle when you need to work on your carb and you DONT have to fool with that plastic choke cable connector!!!! I can now rotate my carb 90 degrees in either direction with the choke eliminator installed.