My grandfather had two Mobile Pups,which he rode all thru the depression and the war.They were so prone to overheating,that he had to run alongside on uphill stretches.No clutch or gearbox,allways in gear.The crankshaft extended thru the front wheel,and the flywheel was opposite the motor.If the motor fired back on starting,the scooter went over the front wheel.When we were children,we could ride them in his large garden when we visited.Never had any trouble getting the grandkids to visit.Regards John.