From left to right: Drive gear (black), clutch ring, spindle and spur gear (yellow).
The whole drive train close-up,
the clutch ring and the drive gear are fixed on the shaft, whereas the yellow spur gear and the spindle rotate freely on the drive shaft. 
The whole thing now assembled onto the frame. You can see the small pinion gear on the motor and the auxiliary spur gear (black). The only torque applied to the yellow spur gear comes from the motor via the auxiliary gear, which also rotates freely on a fixed shaft and bearings. Because of the centrifugal clutch, the transmission can only be engaged by the spur gear moving forward. So, when the motor is stopped, the drive gear is still rotating, since the clutch ring only allows it to rotate forwards. With the frictional forces present around the drive shaft, this should bring the vehicle to a smooth stop.
From left to right: Drive gear (black), clutch ring, spindle and spur gear (yellow).
The whole drive train close-up, the clutch ring and the drive gear are fixed on the shaft, whereas the yellow spur gear and the spindle rotate freely on the drive shaft. 
The whole thing now assembled onto the frame. You can see the small pinion gear on the motor and the auxiliary spur gear (black). The only torque applied to the yellow spur gear comes from the motor via the auxiliary gear, which also rotates freely on a fixed shaft and bearings. Because of the centrifugal clutch, the transmission can only be engaged by the spur gear moving forward. So, when the motor is stopped, the drive gear is still rotating, since the clutch ring only allows it to rotate forwards. With the frictional forces present around the drive shaft, this should bring the vehicle to a smooth stop.
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