Sorry about that, here is a better explanation. I am building a board track racer, and it is geared very low. Because of my low gearing, it puts a lot of stress on the engine's clutch and other drivetrain parts. Currently, I am working on a Briggs and Stratton powered BTR and the gearing is low(2.5:1.) Since my gearing sucks, I need another means of off the line acceleration. That is when the idea of adding an electric motor came into play. Right now, the bike weighs less than 65 pounds in its current state. Fully dressed and with me on it should be between 270 and 300 pounds. My question is, what will be a suitable electric motor and battery combination for my bike? I will be using the motor to take off and occasional bursts of power for hill climbing and such. And just clarify, I need to accelerate 270 to 300 lbs.