1937 ZTU carb.

Just use specs of later Marvels. 3/4 turn on idle/mix and 2 1/2 on main jet as starting point and tune from there. Float lever should be parallel to carb top if remember right.
 
That carburetor has the round float if I am not mistaken. I am really thinking of the TRX carburetor.

I am thinking 1/4 from the top will work-(measure with no gasket), but some of the other MM guys will know for sure.
 

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