Smaller lighter and quieter MB engine

furry, getting a sprocket on the motor shaft shouldnt be hard. then get a sprocket on existing pedal crank for the chain to the motor. with 24 gears existing usually, some of them are bound to suit :) as long as the initial reduction produces similar torque to pedaling.

this motor may be used in some honda chain drive products which you could intelligently mimic for your purposes - half the reduction of a garden tiller e.g.
 
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