Brian.........you ask how to adjust the M/S carb. I recommend the down-pointing mainjet, 2-turns and LEAVITT!!!
I then adjust the side-pointing idlemix for FASTEST idle, NOT SMOOTHEST idle. Understand the difference??? I then adjust the BEHIND the carb idle speed for a SLOOOooow 400-rpms (ennythang under 500-rpms is good) I do this 3-times. Remember, the side-pointing idlemix is BASSACKWARDS; out fer lean; IN fer ENRICH. The last time I adjusted the carb on my eazy starting 6-volt 52-8N; the side-pointing idlemix was 1/8-th turn and idle was 435-rpms. Yers should be similar. ........HTH, Dell