For a 200 lb rider (doesn't everyone weigh 200 lbs?) I've read that 11gm rollers ought to be about right for decent acceleration and still allow top end. Youtube, the forums and the internet are loaded with lots of "what to do" and "how to do its" to get better performance from your scooter. 150cc isn't very much if you intend to cruise more than 45 mph.
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