Hey man i got a 1977 puch maxi 1.5 e50 too. I have a dellorto 16.16 sha on it and jsut put a proma gp on it last night. The boost i got was crazy, like 10mph and acceleration. It's my first ped so i loving it all. Not sure what jet i got in there, but it was 4 sroking before and now it's not, so i gotta rejet it im pretty sure. Ive got a 70cc airsal on the way and since ur setup seems very similear to mine, what jet range do u recomend, I gonna hit up scooter dealership and get alot so i wont have to wait later to jet properly.