Are the 4 brass nipples on the carb vacuum

There are four Brass nipples on the Kihein Carbs of my 1981 Kawasaki 750 H2 4 Cylinder. 1 per Carb. Are all 4 of them Vacuum? Or are 2 of them vent? If 2 of them are vents, which 2 are the vents?

Any help would be greatly appreciated.

I'm pretty sure yours is exactly like my KZ750 H3. The two on Carbs #1 and #4 are for vacuum on the smog system. If you don't have that installed anymore, those can be plugged. Carb #3 has a plug in it. Carb #2 is connected to the vacuum petcock.

That's the way it's on my bike and shows in the manual.

The four brass barbs on top/front near the mixture screws are vacuum fittings. If there are vents on your carburetors, the vents will either be plastic tee fittings that hinge between the two carb pairs in the middle of the carb bodies or the carbs will vent through the BIG holes in the intake venturi edge.

O.K. Thanks for all of your advice it has been very helpful

Steve