Please let us know if you have any questions.
The power locks connector with red and blue wires goes to the on/off switch.
Twist throttles with two brown and two orange wires are for single speed controllers and the 800 Watt controller that you have is a variable speed controller so they are not compatible with each other. A variable speed throttle with three wires such as our item number THR-35 will need to be used with the 800 Watt controller.
We carry a wheel sprocket for 8mm chain which fits the Razor E200 scooter which is out item number SPR-844B and is sold on this page: www.electricscooterparts.com/sprockets8mmchain.html
Please let us know if you have any questions.
Jamie