I know it's loosely coupled with the voltage, but it's the voltage on the motor. If you reach out and stall the motor as it's running, the chuffs will stop. Like George says, if there's motor voltage, it should chuff. If, for some reason that's not consistent, add a 5W 100 ohm resistor as a motor load. I don't know why you'd need this, but if you do...
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