well anothe way around it depending on your frame and motor location as it is hard to sumerise with out a pic of your intensions or limitaions regarding the bike frame motor location is this.. weld in a botom bracket 3 set the bolts on crank arms that way you can bolt on a crank arms that will take a sprocket on both sides this way you can run a left side chain from your motor to the botom bracket you have installed and then run a right side chain down to your wheel.. also you could run your pedal chain to this right side as wel or spin your pedal cranks around to run on the left sode what ever suits .. i did this runing a south poor drive sprocket and my pedals fre wheel leaving the motor direct drive it alows me to have the pedal crank or motor runing through the gear hub so i have 8 gears for the engine or the pedals im at the moment working on a seperate gear set so i can have the engine and pedals ruining to seperate gear sets so i can be in different gears eg higher gear fro pedaling while changeing gears helping the motor all atthe same time.. your imagination is only limited buy the restraints of normalty think outside the box..lol.. all is posible