Moped Army

puch maxi sport two speed with a stock 12mm bing carb.
standard jet is a 50 for this carb but i've got a 52 and its running slow (22-25mph). i figure if i'm getting a new jet anyway, i might as well get a new filter also and up the jet to match the filter rather than lower the jet to the stock filter.

i'm keeping the stock pipe so i'm not expecting much boost but for $20-25 it seems like it would be worth it if i get any jump at all.

so here's the question. any thoughts on what size jet i should get? i'm thinking somewhere in the mid 60's. i'v attached a pic of the filter i'm prob getting. i live in Baltimore and its getting pretty cold out if that makes any difference.

thanks for the help