MOPED ARMY

hi all, can anyone answer this one? recently there was a post on carb numbers and what they meant. ok here goes, 78' puch maxi 2hp, with a bing carb. carb reads as follows: 1/12/307. manifold says 14 on the side. in the recent post there was a list of numbers ans what model they matched up with. matching my numbers with the list it says puch maxi luxe 2hp, main jet 58. which is correct. my manual says puch maxi on it. the side covers say newport, and this list says maxi luxe. lol :-) any one wanna atempt this one???????? one more thing, is this the biggest 12mm carb they made for it, or can i upgrade to a bigger 12mm? or should i just go to a 14mm. thanks ahead of time.