Hi there,
I've struggled to find Mikuni spares at times - I suspect Kehin spare might be the same.
Possible suggestions - racing outlets, Dennis Trollope etc springs to mind.
Tuning houses - TTS performance? etc (can't find any on their website but they might know)
Finally - Chris Kelly at Ca Cycleworks in California seems to be 'da man' in my book for flat side stuff for Dukes - out of the UK I know but might be worth it for the knowledge:
http://www.ca-cycleworks.com/shop/ca...cati/fuel.html Good luck - Frank