hifi engine

Concord F-88 reel to reel tape recorder

I recently purchased a F-88 tape recorder and am having difficulity getting it to run. The small drive motor that turns the reels will run for a few seconds but then gradually slows down to a stop. I am using new batteries but do not have the 6v converter unit that originally came with the recorder.

I am not and electonics person, so did not open the motor housing. Any suggestions on how to fix or find a working motor?