Changing low speed setting on chinese controller

tns

New Member
My friend has a deluxe 3 wheel scooter (Lo-Hi, Fwd-Rev, full lighting). The problem is the lowest speed it will maintain is too fast (faster than walking pace). I was looking for a mod that would lower the lowest speed. The chinese control box does have a readable part# (wzkd4830...), but I get no results from searches. The twist throttle on this looks like it might be a simple potentiometer used as a voltage divider, and depending on how it is wired in the controller a simple series resistor might do the trick. On the other hand, it could be that the lowest speed is something hard-coded in the firmware. Does anyone have experience in this area?