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3 + 3 gave me 3-4 mph better top, although there's no much open road where I can use it. everything else is like 6 x 5.5 and I'm thinking of ordering 5.5 sliders too. in my case 5.5 gr are perfect in any combination.

for the belt:

http://www.powersportparts.net/GATES-SCOOTER-BELT-STD-PL20507-p/68-20507.htm

agility is not listed but it uses the same as vitality or people 50. it seems I'm using standard belt. 748 mm is the right dimension. This is outer edge length but some manufacturers do measuring through the middle or 1-2 mm under the edge. I found out that bando 729 mm is in fact 740 mm in outer edge. wrap a thin rope around your belt and measure it. That will tell you dimension. up to 748 is ok.
and when you install new one, drive slowly for the first 4-5 miles and gradualy push it up. belt needs break in period also 
 

if the petrol fumes are gone and engine is running fine on idle with 82 jet, but bogging down when you twist the throttle, try:
-change engine oil
-clean or replace the air filter
-clean or replace spark plug and measure gap to 0.7 mm
-adjust valves
-check(I guess you already did) carb. diaphragm for damage
-vacuum hoses
-inspect and clean crankcase breather hose/tube

well, today I was busy and worked on a roller weights set up.
A lot of work on cvt cover and variator removing/installing and test drives  

I'm 160 lbs, so:

6 x 6.0 g - too heavy, average acceleration and takes too much time to top speed. Uphill is very bad and droping rpm's low but I guess mpg should be a little bit better. Mainly for flat roads.

6 x 5.7 g - better than 6.0 g but still not good enough.

6 x 5.5 g - optimum for acceleration/uphill/top speed. Top is 4 mph less than 6.0 g but gets me there faster.

6 x 5.0 g - best take off but mid-range accel. is average (too high rpm's between 15 and 30 mph), after 30 mph accel. is smooth and constant all the way to the 45 mph. Although, steep hills are not problem and rpm s are high and pulling up with no problem. less mpg  'cos engine is revving high. Mainly for hill roads or when riding passanger back and not for flat terrain.

3 x 5.0 and 3 x 5.5 g - as much as 6 x 5.0 g but mid-range a little better.

3 x 5.0 and 3 x 5.7 g - even better than previous set up, better start, even better mid-range and ok top.

3 x 5.0 and 3 x 6.0 g - in my oppinion the best one. got all performance of 6 x 5.5 g but also better off the line and better top. Hills are not the problem and it's pulling up even better when I release throttle for a second or two and get it opened again. flat/hill terrain optimum. The only thing I'm concerned about this 3 x # and 3 x # set up is variator balance and uneven rollers wear 'cos I wasn't using it enough to make sure about this one. Anyone had some issues, please let me know


That's about result of my testing.
Hope I didn't choke you with this one                

streido, you're right about gearing question here. I'll leave it for now as it is 

anyway, today I drove on a 0.5 mile light downhill road and got top speed off the tacho scale but gps said 53 mph.
this was with 3 x 6.0 g and 3 x 5.0 gramm roller weights.

just to mention, I'm weighting about 70 kg or 160 lbs
and for now I'll change to 6 x 5.0 g for better take off and hill terrain driving

that s very cool and cheap solution and proves scooter as an even more usable and efficient form of transport

it looks romantic 

Malossi final transmission gears are advertised as a 10% more speed upgrade.
Anyone had experience with these or any other manufacturer?

Your configuration is very simmilar to what I done on my kymco.

-82 jet
-CDI de restricted
-5.5 gramm malossi rollers (optimum for my scoot ). With stock variator I could use rollers from 3.5 up to 8 gr and top speed was the same 'cos belt was too short. Now roller weights makes a lot of difference. I tryed 5.0 gr, good for steep hills but loosing 3 - 4 mph top.  
-malossi multivar
-white torque spring. I also thoroughly cleaned driven pulley, clutch springs, paper sanded pads and bell and greased torque drive. What a difference. After 16 000 km it was so dirty and sticky.
- 748 x 18 x 8.5 cm  30''  belt

Much better off line acceleration, 35 -40 mph up hills(a little better with 5.0 g) and 45+ on flat road(garmin gps measured). But these performance are very sensitive to parts calibration and wear.

Guess quality big bore and up jeting is the next step but I'm not going to invest any more money because it's my second scoot and I'm very satisfyed now considering it is 50 cc.
I just do regular maintenance and it's running fine :-)