A few things I would look at to get best speed out of a scooter are:
Are the tyres at the right pressure. low pressure will create drag and can slow the scoot.
Is the air filter clean? Blocked filter will make motor run rich/ down on power.
Is the throttle ajusted proberly? if not the carburator slide may not be fully open when throttle is twisted fully. - motor down on power.
Are the brakes ajusted well. Brakes that drag badly on the disk/drum will sap power and speed from the scoot.
Is there extra weight on the scooter I don't need? Carrying stuff around that is not really needed today wastes motor power.
Is the sparkplug due for replacement? A worn tip or gap on the plug can cause weak spark. A weak spark can cause poor fuel burn, and less power from the motor.
Does the exhaust need a clean out? Two/s burn oil in with the fuel. often that creates a carbon layer in the exaust. this can block escaping gases from getting out, and restrick the incoming fuel/air load. ='s less power.
At the end of the day,, it's a 49cc scooter. Don't waste money trying hot ups unless you've got money to waste! Hot ups will likely make it unreliable, and a broken down scooter only does 60Km/h on the back of a trailer.
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