I agree, does not look GFI, GFI has a tab inside the lever which is visible.
The motor is worth checking if it can be looked at by someone knowledgeable and quick as the delay might cost you more than the savings from motor.
As for symptoms, from the description it is not clear if the motor is stuck and makes noises, or ot tries to rotate and then trips the breaker.
In the former case I woud try to see if the shaft is stuck, lubricate and try again (happened to me once), in the latter - likely a turn short, toss it, buy new.
