there is an article on pats site about linking the carbs using the balance pipes on the intakes
If there's one silly urban myth that tops all others in the motorcycle world it's definitely this one. Don't waste your time with it, it does nothing, it's just bad science. Anyway, after an initial placebo effect of thinking the bike is smoother etc you'll be taking it all off again within a few weeks because it does look a bit silly. Try a different ignition advance/retard(sic) plate if you want a 'smoother' bike, it does work. But most of all make sure the bike is properly serviced before messing with any engine 'improver' mods.