Honda Express carbs

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Specifically Sizes and ID Numbers

I have two Express carbs laying around and I got them both out to look them over. I also looked at my Shop Manuals for both NC50 and the NU50 Urban.

The carb spec'd out in the manual for the Urban is a PA 13E, the other manual for an NC50 Express had no ID numbers available. The second carb ID number is PA 25A

The venturi size of both carbs measured the same @ 12mm. The mounting flanges have different bore sizes @ 16.5mm and 13.78mm for the Urban carb.

The filter mounts are the same @ 25mm.

I did not open them up to inspect the jet sizes.