Question about my Hitachi carbs

I am cleaning the carbs on my 1985 xj700, I had a question about the ports on the carbs as the bike did not come fully assembled and the manual I have makes no mention of what these are. From what I gather, the center is the fuel supply, the two lower are vents.. but what are the ports at the top on each carb body? I tried searching the net and no dice.. I attached a photo of the ports I am speaking of. Thanks in advance for any help.

 

XJ700 Models:

Years & Models: 1985-6 XJ700 air-cooled models
Carb Manufacturer: Hitachi
Carb Series: HSC33
1985 Carb Model ID: 1FG00 (N models) or 1JJ00 (NC models)
1986 Carb Model ID: 1NH00 (S models) or 1NK00 (SC models)
Main FUEL Jet Size: #107
Pilot FUEL Jet Size: #36.5
Main AIR Jet Size: #70
Pilot AIR Jet Size: #210
AIR COMPENSATOR Jet Size: not used
Starter FUEL Jet Size: #36 (non-replaceable, in float bowl)
Main jet NEEDLE ID: #Y-20
Main needle JET Size: #3.2mm (the main needle JET is also known as the "power valve" or "emulsion tube").
Fuel Level in float bowls: 1.0mm +/- 1mm (.039" +/- .039")
Idle RPM's: 1,050 rpms

Most likely ^^^^
From what I know they are vents to atmosphere that have a tube from them running back from the top of the carbs. Had a quick look for more info but didn't find it. Search for hitachi HSC 33 carbs.

 

Just took a look at my bike. Those ports have hoses attached that run back to between the engine and air box. I believe Bushy is right about them being vents.

 

Thanks for the response guys. I will just put some hose on them and route it somewhere