zenith carburetor rebuilding questions

bimoverde

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as stated in this rebuilding procedure:https://www.e9coupe.com/tech/zeniths/bmw1/bmw1.html
the float level is determined by the thickness of the shims under the needle valve. I don't seem to find the proper washer thickness in brass..does it have to be exactly 2mm and why would there be a difference between the 2.8 liter and the 3 liter?
I came across different resistance (homs) for the term start valves (14 and 20 homs) which one is correct for the 3 liter cars)??
thanks for your help..
 
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