Help finding controller info

[bj97301]

I found it on Alibaba but the sellers won’t get back to me with any info. I figured our most of the wires but could use help with things like regen braking, 3 speed switch and any other functionality I might be missing out on like this strange wire labeled yb on the pcb. I have two scooters and one with the same controller has a top speed of like 12mph. I would love to figure out what’s making the controller so slow. The other one tops out at about 20mph. The controllers are popular among the fat tire scooters. Links below:

Link to better quality pics: https://photos.app.goo.gl/fnyc3nqYDdmBa6UC8

Ali link: https://www.alibaba.com/product-detail/Electric-scooter-bldc-48v-60v-1500w_62389322950.html?spm=a2700.12243863.0.0.72463e5fnfY4u7

Fat tire scooters where the controllers usually go: https://www.alibaba.com/product-detail/The-most-fashionable-citycoco-europe-2_62106410570.html?spm=a2700.wholesale.pronpeci14.5.3b271280HvetTK

 

[motomech]

You might want to post this in the ELECTRIC SCOOTERS AND MOTORCYCLES section.