First off you need to check the amp requirement on the DC motor. Some small DC motors have a large mA requirement. Some may go as high as 2 amps !! Hopefully there is a plate on the motor to help guide you. It sounds like you are not getting enough "power" from the adapter, you might have to step up to a charger to obtain what you need. If you have a good relationship with Radio Shack take it to them and see what they suggest.
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