Shown by the arrows are the vent tubes, slide 'em on.  The flanges they fit on can rotate and need to face and angle as shown, and the tubes should have a plastic connector at the top to keep them together. 

...by rotating the carbs together.

Remember that spring tab I said to keep good track of, put it back in the holes circled at right...

Of course, you can't buy the O-rings for the T-shaped fuel connectors between the carbs, from Honda.  They only sell the whole "T" for $17 a piece. I found these green ones supposedly for AC applications.  So far no leakage after a year. (Updated, now 4 years ago)

Connecting the outer carbs (1 and 4) to the inner carbs (2 and 3 at top), involves fuel connectors, as shown.

Starting to look like something!!

Yea, sometimes I just can't resist, but it's real important to walk away from this stuff for at least a few minutes every so offten.

OK - you've got'a be real friendly when you get this close to these guys!!