Adding the crank back will be the trickest part of the build. On the old BoardTrack racers, the crank shaft was used as a sprocket shaft as well.
So, we are going to attempt to fabricate a custom crank shaft that will also serve to locate the clutch. We purchased a semi-automatic clutch. We will drive the clutch from the engine sprocket by chain, the clutch will rotate on the crank shaft. The pedals will have to be extended out to about 10 inches crank to crank. We hope we will be able to use the pedals primarily for starting the engine and braking. We will probably end up supplementing the braking, just haven't got that far yet.
Thanks for the feedback.
Mike