You may be able to push it out from the top, but that approach is fraught with difficulties. Here is a Honda (Keihin) one I tried that on:
[Linked Image]

The problem is that the top (main discharge) of emulsifiers is precisely shaped to do a job, and it will do a different one if its shape changes.

I think the key issue here is whether the main nozzle is actually held up by the float bowl retaining nut. If it is, it is now only supported by gum, and if you do a good enough job of removing the gum, it should drop out. Can you carefully inspect the top of the nut, and the bottom of the main nozzle, and tell us whether they are supposed to be in contact when the nut is screwed in fully? If they are, the nozzle is now only supported by gum, so you just need to remove nearly all the gum and soften the rest, then push the nozzle downward from the venturi end, as you proposed. I think it is safe to try this if you only push very gently on the top of the nozzle. If it won't drop out with gentle pressure, hit it again with the carb cleaner. I can tell you that we have had a couple of threads where people tried to do this with Honda carburetors and failed - presumably through not enough persistence with the carb cleaner, because on those carburetors the emulsion tube is definitely a loose fit in the carb body, and drops out readily if it is not gummed in.

On the other hand, if the top of the bowl nut does not contact and support the bottom of the main nozzle, it is probably a press fit and cannot be removed. If you look at the Carburetor Disassembly Procedure on Page 14 of the manual (Page 17 on the Acrobat page counter) it tells you to remove the "main nozzle tube" on Series 7 carburetors only. The subject is not mentioned for other series, and that makes me worry that it may not be removable.