That pipe that leads nowhere, in my carb there was some amount of dirt sucked into float ventilation valve, which had then stuck well solid, had to take it apart and clean it, also it did not move well without lubrication, then I did add fuel filter to end of hose to prevent more dirt from entering that place. However I think something more elegant solution is needed.
I did found car gasket kit for carb, it is same for z4 and z11, I still need float and I'm not too sure about jets and emulsion tubes, need to check if those are ok and not modified.
http://jtbo.pp.fi/images/album/360/cisac2/service_kit/
One thing is that carb bottom, base plate, when carb is tightened too tight (should only be something under 10Nm!), that soft metal used to make carb tends to give and bottom of carb is then U-shaped.
Piece of windowglass (thich one if possible, like aquarium glass) is good surface, put glass on table, then put wet sandpaper top of glass you need to attach it somehow, then disassemble carb and take off little bit from bottom of carb by moving carb against sandpaper (sorry sounds stupid, my limitations with words

), take ass little material of as possible, remember to add water to sandpaper so it won't get chocked, when carb bottom surface is evenly clean it should be straight and it will be good. Takes few hours, but I guess that it is needed to make carb act like they originally did.
This was how my carb had warped:
Here is pic of my sandpaper setup:
Here you can see how at first only edges are touching sandpaper:
There is few other random shots:
http://jtbo.pp.fi/images/album/360/solex%20cisac/
Pics of carb + technical drawings and stuff:
http://jtbo.pp.fi/images/album/360/cisac2/
Also in technical resources section of this website there is information how to set idle mixture base setting and idle rpm base setting, can't remember now how many turns each of those were, but it is all there in documents.
Maybe not help for pyro anymore as his carb works, but maybe someone else can use this stuff...