Kawasaki Byou 220 Carburetor Lines

[Windyman55]

I bought a new carb for this byou 220 refurb. But can't figure out where the hoses go to from the carb.

I have the obvious 2 figured out. The Fuel Line (A. RED ARROW) It's barley visisble. But it's there.

And 

C. Carb overflow.... I think. (C. GREEN ARROW) That would just hang down.

It's line B. with the BLACK ARROW

AND

Line D. with the BLUE ARROW That I can't figure out. 

Any help would be appreciated.

Greg

[ColonelForbinMcGrupp]

A-is correct C-is correct, the overflow just hangs down. 

B- Is a vent that connects to a t-fitting that branches off connecting to a vent tube on the left side of the cylinder head and to a vent tube that runs to the rear diff. Not a big deal if left disconnected, just runs a little lean.