Hi, Friend. About the max speed question, there may three details need to check. First of all, there are five PAS levers on the lcd display, the 5 lever is the max speed version. So please press up button to the 5 lever. Secondly, please check the lcd display settings if correct or not. Because wrong settings will make the lcd display show a wrong speed even the motor max speed is right. Here is the right settings of lcd display for the 2000w kit : 1P=03 2P=01(mph) 3P=52(battery's volts) 4P=5 5P=0-5 6P=29 (wheel size)
7P=46 8P=100 (unlock speed)
9P=00 10P=2 11P=1 12P=5 13P=12 (PAS magnets is 12pcs)
14P=35 or 40 (current amps) 15P=0
At the last, If the max speed still slow, could you please take a short video of the max speed without loading? Usually, the display will show around 80km/h max speed. Our support email is support@kirbebike.com We will try best to solve your problem.
Sorry for the inconvenient.