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In the variator. Take off the belt cover, and its the wheel on the left or toward the front of the bike.
Universally, they should be near the kick starter and at forward end of the drive belt.
in the variator take it apart n pull out the old rollers n put in the new 1's
In 1490 da Vinci sketched a stepless continuously variable transmission - a Variator.
try a washer on the variator located within the transmission. between the front pulley left and right assembly parts.
variator, exhaust,
replace stock CDI with a performance CDI, check variator for a washer behind the outer pulley, check exhaust for a restrictor gasket. most state laws say that a 49cc can not exceed 30mph so do this at your own risk.
their are inside your variator which is connected to your drive belt
To make your 50cc 2-stroke scooter faster, consider upgrading the exhaust system to a performance model, which can improve exhaust flow and increase horsepower. Additionally, tuning the carburetor for optimal fuel-air mixture can enhance performance, as can installing a performance air filter to improve airflow. Finally, replacing the variator weights can alter the scooter's acceleration and top speed. Always ensure that any modifications comply with local laws and regulations.
valve variator
First if your fat go to the gym, second buy it a performance kit, third go to www.partsforscooters.com they have a wide variety of performance parts for scooters, dirtbikes, and minichoppers at low prices. it is a good website to order from i recommend it.if you are talking about a full size scooter you would have to get a CDI that has no rev limiter and remove restrictions in the variator and exhaust.that is how you do it cheaply, of course there are mods available to improve performance.
If it is the 2 stroke you need a 70cc mid race kit, 21mm carb, expansion chmaber exhaust, Malossi or similar variator and higher final drive gears. If you do all of that you will have a 60-70mph scooter with much much better acceleration than standard.