This bike is new to me; a first time owner of BMW. My carbs are 40mm. However, the previous owner molested the bike... ALOT. Hence the carb numbers 94/40/107 and 94/40/114. Not the best combo but the bike does run and idle fine.
The ignition is electronic. Again... according to the PO, it was stock as of 79. I have not looked into this yet.