ventilxp crashed and is now a shadow of its former self. they lost all their content.
you want to do this:
dellorto 15:15 carb with a jet in the mid to upper 70s.
doppler ER3 reed setup. these are carbon fiber and let in waay more air than the stock setup.
check and see if that bike has a 3 or 4 ball variator. i'm betting its a 4. if it is, take it apart and take two of those balls out.
widen the exhaust port about 1mm on each side, raise it about 1-2mm. this wont hurt anything, and stock AV10 cylinders are a dime a dozen.
get a 50cc malossi hi-comp head with the decompression valve.
i bet that bike has points too. make sure all that stuff is in good shape, and you may want to retard the timing just a 'lil bit. none of this will change the appearance of the bike whatsoever and you'll be very pleased with the results.