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carbs??
I have not seen a 150cc with multiple carb setup- are you sure it is a 150cc? even the 250cc roketas are single cyl / carb
based on your other info, you might consider re-cleaning the carb and jets, checking the air & fuel filters or replacing them, adjusting the valves, cleaning or replacing the spark plug (make sure you gap it correctly)
fyi.. I am heavier than you and my primary testing scoot is an '09 63cc PS model 803 that I have a gps verified level speed of 38mph and downhill @ 45mph (latest figures). considering you have a 150cc, it should easily haul you at 45 - 55 level road
IF you get it running the best it can, and still don't get the speeds I suggest, check the CVT
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