I need help with a Bafang CST which I just opened to substitute the nylon gears. After opening, and learning that the motor was in perfect condition but for one split gear and another one with a damaged teeth, I ordered replacement gears, swapped them, mounted everything back, and... I have got a problem.
After screwing down the plate, the wheel does not spin freely. To give you an idea, the forward drag is comparable (if not a tad higher) that the drag I get when I counter-rotate the wheel, which engages the motor.
The fact that this drag appears only when the cover plate is screwed down fully makes me think that I made a mistake with shims or washers. Unfortunately I did not take pictures while opening...
Is there anybody out there that could tutor me in making sure that everything has been mounted correctly?
Thanks in advance for your time