So I got myself a 63cc Malossi for my Moby from Europe over the christmas holidays. I have a Dellorto15/15 sha and the bigger intake. The rest is bone stock. No port matching. I am considering a 73 or 78 jet for the break-in period. The french/italian manual what came with it, suggest a 20:1 gas to oil mix ratio and a Marelli 240w as the proper spark plug. I try to run a NGK B8RHS, since I coudn't find any cross reference for this particular plug.
What are you running?