Hi all you like minded V4ers! Havin put up with jerky/irratic/down right annoying throttle problems on my April 07 UK registerd 800 and havin no joy with the so called "Honda Trained" engineers/mechanics I have now successfully balanced the throttle bodies and smoooooooooooooth is the word. No magic..only special tool is the vacuum gauges (mine are Carbtune) which I understand can be lashed up anyway from a squeezy bottle etc etc and a little patience. All the issues about PAIR valve isolation etc is BOll Ocks, blanked off or not they don't change the differential vacuums which is what your interested in, all referenced to number 4 cylinder. Lots of descriptions out there how to do it, same principles as setting up a carb bike really .... good luck... get balancing !!