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Really nothing get a 150cc
Installing a bigger piston is one way to make a 150cc go faster. There are also kits that can be purchased to modify a 150cc to make it faster.
but a engine in it
get a bigger engine and make sure you wear streamlined clothing
It has a top speed of over 50mph approx.
the brake
An improved flow of air and fuel mix will make the scooter faster. You can do this with an aftermarket exhaust.
Go downhill
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Loosen the headset a bit.
Yes it will make the scooter go faster, but you could run the chance of blowing parts in the moter if you do so
push it off a cliff