Sorry it took so long to get back - had a few gigs this weekend.
That's an interesting idea Matt. I checked the rubber caps and they all look fine, are pushed all the way on and tight. I removed the AI system long ago so I don't have that line to worry about. I'm wondering if it may be electrical somehow or possibly an artifact of the bike running slightly lean?
I'm guessing it's running a little lean since I haven't drilled the plugs and set the adjustment screws. Likewise, in some ways my BA exhibits the same behavior the Trophy did with the fast idle. Adjusting the air adjustment screws on the Trophy fixed that problem.
Keith