Anyone into old minibikes?

Picked up a 72 Powell Challenger rolling frame from a customer, all I need is a 5HP B&S and a throttle....and 2 new tires...and a seat...and? Check out the expanding band rear brake (other side of wheel hub) and integrated rear tire sprocket. Even has a swing arm rear and telescoping front forks! The motor rocked in the frame to alter the slippage of the belt to regulate the torque and speed to rear tire, no clutch! The spring on the top tube was the stay for the lever that pushed the motor forward to engage the drive belt.
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My goal......5f018920.jpg