With scooters restricted via the CDI, it is possible to achieve higher RPMs and top speed by simply connecting a new ignition unit, such as this one offered by Motoforce Racing.

The original ignition can be easily replaced with this un-restricted version. 

Attention: to make sure you choose the right version, please compare your scoot's plugs with the ones on the picture!

NOTE: fits virtually all Chinese bikes with geared pit-bike engines with a single 5-pin connector block as shown in pic.
It cannot be used if your old unit has only 4 pins.

Motoforce MF12.00054