I use 2WD and have for over 2 years...
From MY experience, I PERSONALLY, get MUCH better efficiency then using a single motor.
When using a single motor, single battery setup, I get about 35 miles out of a 36v 20AH battery...
Now, from what I'm seeing most people are saying that adding another motor/battery would be less efficient?!? (Using ONE small battery on TWO motors yes.. BUT!!)
Not even close... When using both motors and both batteries I get a MINIMUM of 80 miles...
Now mind you, that I (almost) NEVER run WOT... and 99% of the time I'm barely at half throttle...
Using much lower loads (re: amps) gives me MUCH more AH (Actually WH/Mile) out of my batts/motors..
Look at it this way.. Pull 20amps out of your 20ah battery constantly and then pull only 6amps from each of two 20AH batteries (which for me, equates to the same speed as pulling 20a out of one motor) and see what the distance is comparatively speaking..
For me it went from 70 miles (2 batteries (One at a time) / 1 motor) to EIGHTY miles using both batteries and both motors.. that's a 15% increase in "efficiency".. It's basic "battery physics" and REAL WORLD (FOR ME) facts...
For curiosity sake, for those who use dual throttle setups for their 2WD's, which side do you control the rear motor from and which side do you control the front motor from?
And to answer your original question..
Left Throttle = Front Motor
Left Brake = Front Brake / Rear Brake Light
Right Throttle = Rear Motor
Right Brake = Rear Brake / Motor Cutoff for Both Motors.
For those that think I'm "full of it".. Here's a pic I just took of my bike...
(I'll have a better pic of it tomorrow when it's daytime.
P.S. This "new build" is in the process of being worked on, so it's not exactly 100% "pretty" yet..
(I'm waiting on my custom Tread Plate (Brite) Aluminum Battery Boxes...)