From Moped Wiki
Ok so I've got a 1980 Honda Express II, NA50, modified of course:
Malossi 70cc Piston and Cylinder kit Weak Ends Intake Mikuni vm 20mm round side carburetor Uni Air filter Boyesen dual stage modified reed valves
the bike runs great but I feel like i could get more speed out of the machine with larger clutch? Does anybody have any ideas?