[Kevin Sevcik]

You're probably going to need more heat than a lighter will provide.

Something like a propane torch would probably work better. If you can heat the wheel/shaft up from the side opposite the motor and hit the motor with freeze spray or a continuous jet of compressed air then you should be able to keep the motor cool enough to avoid damage while you're getting the shaft off.

On the other hand, it sounds like you don't care about the motor that much. In which case flame on till you loosen up the epoxy enough to extract the motor. Just make sure to do it in a well ventilated area.