Do the Bafang BBSxx kits adjust the assist levels by limiting the amps that the controller provides?

 

Example:

 

Level 1 - 10 amp limit

Level 5 - 15 amp limit

Yes.

Also,the harder you pedal,the less assist it gives.

The way the controller is programmed is to limit the current at different assist levels, and also to limit the maximum speed of the assist - motor speed (i.e. pedal cadence), not bike speed. What this means is that at low assist levels you only receive assist up to a low pedal speed. Higher assist levels spin the pedals faster. That behaviour can be changed by reprogramming the controller using a special cable should you so desire - you could have full current to varying cadence speeds (would be weird) or varying current to the same maximum pedal cadence.

 

Michael