..it's all about getting into the good rpms...
..all about tuning to the pipe...
..but keep in mind, that once you install a 1500 contra, which s9lc scoots just seem to lloovvee, you probably going to need to stiffen the fly springs, in order to take full effect of the increased tension ...
..people keep shouting heavier rollers..it's never worked in my scoot, and nina jumps to 9000 and hovers there till i start to approach 55mph..
..now, she does have a pipe and filter, buti still remember 8200+ being a strong powerband when she was oem...
..get you some 9.5 and some 7.5 and give them both a try..i'll buy the 9.5s if you find you dont need them..