And it looks just like the Proma so maybe the same preformance boost!
Take a look at this site for a pimped out PA50 II
0 - 50 km/h : 5 sec
30- 50 km/h : 2 sec. (!!)
Topsnelheid : 90 km/h
90 Km/h (56 mph) top speed.
That would scare me crazy going that fast on a moped.