Thanks all for the info. Is cutting the motor some kind of protection? My battery is an 11.6v and the controller is 16amp. What it sounds like is, the motor is good for the roads & smooth trails, but when it come to the rougher stuff its found wanting. I will use the 8fun for that purpose. Can the cadence speed be reset to a lower one/
Thanks for the help
You probably mean the battery is a 36v type, and I believe the controller has a max amp output of 15 amps.
The motor should be running as long as the pedals are turning. It is designed to stop when you stop pedaling, or the brakes are applied, for safety reasons. Also it helps prevent damage to the motor and drivetrain.
If your motor is cutting out whilst the pedals are turning, you have other issues.
AFAIK, the cadence control cannot be changed, but other parameters can, such as power delivery in each of the PAS levels on the display.
These parameters can only be accessed and changed with a controller cable, PC or laptop, software and a little knowledge of how it all works.
Most of the Bafang units, whether BBS01 or BBS02 come programmed with limited max amps.
For example, you might think your BBS01 has 15 amps x 36 volts = 540 watts available.
But in reality, they are usually factory programmed to limit the amps to 60% of what they have stamped on the unit. See 'Keep Current' referenced on page 3 of the following link:
http://www.emax-ebikes.com.au/uploads/3/7/4/4/37442009/programming_bafang_bbs.pdf
So in your case, 60% of 15 amps would equate to 9 amps x 36 volts = 324 watts available.
I can understand why people might buy these units expecting a bit more oomph, but end up feeling a little disappointed.