Re: Will it fit? ;-)
5mm jets - you can get them from SickBikeParts.com
From what I've seen, .72 and .74 are the optimal upgrades for the 48cc kits, and .74 and .76 are the optimal upgrades for the 66cc kits. Every motor is unique to how you break it in, how you ride, how you maintain it and how your bike below it runs, so there's never exact figures.