New data:
Definitely a Class 2 e-bike. There'a right hand throttle, which works to engage speed.
Then there is pedal assist. The pedal assist (appears) to be either on or off, though there's a switch on the left handle... not sure if that's "high" or "low" or what, but there's some kind of difference in how the engine kicks in when "pedaling"... ie how many strokes before it turns the motor on?
No speed control with the pedal assist... not sure if that's the expected behavior or not, it just turns the motor on when the disc passes the sensor at a particular time and then turns it off.
Except for the "ignition off" (missing key), there is no other button to turn off the pedal assist. So, you're either "pedal assist + throttle mode" or "off". One would think you might wish to occasionally turn assist on/off by pressing a button/switch. (this of course I can fix if I want by adding a switch inline with the "key" circuit.