A factory Bion-x kit has the 32 km/h limiter in place to conform with the law. What happens is that the controller detects the RPMs of the motor wheel and using the wheel circumference, as entered in the setup menu, it determines the current speed.

If the speed goes over 32 km/h the controller will cut the power to the rear wheel until the speed drops below 32 km/h at which point it will send power to the rear wheel again. So it pulses at the limit. on, off, on, off and so on when you get to the speed limit.

This speed limiter can be disabled by changing the settings in the 3773 setup menu. Consult your Bion-x manual to find out how the setup menu works. This is where you can set the date, tire size and so on.

When the limiter is disabled there will be no pulsing at the limit. The bion-x will simply keep powering the bike to its maximum. You only gain a few more km/h before you hit the power limitation of the motor.

What about legalities? Well, you are going faster under assist power than the law states but most police officers won't bother you anyway.