larry ... i also have a snark. it had a 14.9 dellorto at first, too. they have poor speed and performance stock, it seems. not sure why they were built that way.
the 14.12 is the stock carb. so if you want more performance/speed, you can go to a 14.14 or even a 15.15. also, check out your front sprocket. mine had a 9-tooth. most minarellis have a 10-tooth or even an 11-tooth as stock. try one of those for more top speed. also ... check your cylinder/manifold. it might have a small opening. if you can find one, get a larger manifold for more performance. also, a bigger airbox will help. finally ... you can get a performance exhaust (polini makes a nice one).
i love the snark. it's perhaps the most classy/beautiful moped ever built. there's no reason why they should go slow. don't ever get rid of it ... but if you do ... my blue 1977 snark eagle deluxe would love a little sister.