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In North Carolina , where Newscooter lives , you don't have to license , insure , inspect or pay personal property tax on scooters of 50cc and under . The potential savings could explain the desire for a people 50 , and the 2t has much stronger performance than the 4t . Good luck .

To be prefectly honest your s9 should do between 45-50 mph . If you need to go faster you would be doing yourself a HUGE favor by selling or trading for a scooter or motorcycle of more than 50cc that will go fast enough for you , also you could look for one that a color is already  that suits you better . Good luck .

Are you sure it is all oil and not raw gas that got dumped into your crankcase after failed start attempts ? Good luck .

I think the general concensus is that while aftermarket pipes may look and sound cooler they don't really affect performance much on 4 stroke scooters . Good luck .

Gas stations that sell non ethanol gas can be found at the puregas.org website . The stations are listed by state and then city . Good luck .

iridium plugs do perform better , but on a well maintained properly functioning motor you may not be able to detect any noticable difference . It will start easier and the plug will last much longer . I have been using them in all my vehicles and think the small extra expense is more than worth it  , especially in a single cylinder application . Good luck .

Youtube has many instruction videos for cleaning scooter carbs . Good luck .