Oregondad, try this link.
http://www.provoscooter.com/malossi-torque-driver-spring-racing-blue-106.html Im not sure thiscwill fit an A50 but mayne give them a call or email and ask?
Im not really complaining Baddi, just grumbling a little bit
Overall im well happy with my A50, i only paid £380 for it (2008 model with 8,500km on it when i got it) and parts are cheap too so to me its just a fun bit of transport to get to work on or mess around locally on. I used to cycle the 9.5miles to work but im afraid my cycle is now covered in dust in my garage.
My only small moan would be with going uphills on a stock 4t, thats why i tuned my cvt as best i could to cope with my commute each day. I reckon a A50 with the 72cc kit would be perfect really with the extra torque for the hills. I dont really want to go over 50mph on it anyway.
I imagine one day i will get round to fitting the 72cc kit but i have too many other distractions at the moment so have no time or money for that right now.