Carbs are off and no need for a good clean - someone beat me too it? some minor scratches on the bottom of the fuel bowl shows me it has just been cleaned no so long ago!

Jets are factory 128MJ and 38SJ -no surprise there for a stock bike and air screws are at factory for a TA22A carb

As for the cause of my problems - the 3 way connector to the air box from the x joint on the carbies looked like this......








Could be the problem??