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I'd say 9-11 gram work best with a red/2000 control spring, and blue (1000 rpm) thru red (2000 rpm) fly springs in the clutch.
Again, this all varies on what the springs are REALLY, and if you use rollers or sliders.
I'd suggest sliders above anything else. That said, with sliders I find that one gram heavier than the rollers I used are best. Say a set of 9 gram rollers work best for you... Then 10 gram sliders will work better.
I hate to say this but that is the ONLY golden rule I have found in YEARS of working on,scoots, and posting/reading forums.
Springs are subjective. What the manufacturer paints them with or calls them means dirt to me until you get into the top two... Malossi or Polini.
Same for rollers or sliders. There are THREE brands to use (so you can trust them to last) Malossi, Dr. Pulley, or Ninja.
There is an old youtube video from Josh or Rich (I forget) that took stock springs from several brands of scoots, and then "Racing springs" from several vendors... In 75% of the tests the "Racing springs were weaker than the OEM springs, and the only real boost in performance came from the brands I mentioned.
In fact Malossi yellow control springs that are sold as an upgrade to OEM were actually weaker than OEM.
Point is, nothing but trial, and error (and a box FULL of spare parts) will tell what will work best for you. If you really want to tune your scoot to be its best for how you ride, I promise you will have several attempts at combinations of rollers, springs, jets, and air filters to go thru.
In the end it all pays off tho. This crap is cheap, and the spares are useful in helping the next guy get tuned. If there is no "next guy" in your neighborhood they make good spares for in-between orders, and deliveries.
Forgot... The cam.
Go with the A9! It will improve top end. Just make sure to double check everything before starting the bike.
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