A scooter like that is just what is needed in many cities, where the small scooters often have 2-cycle engines and produce lots of pollutions. How long ago did you build yours?
Hi Piwoslaw! well,i do the conversion almost 2 years ago.in this time i made a few modification on controller and i change the normal battery with AGM type battery.everything works fine.in the future i intend to switch to 24 volt and put two motors.but this require another frame