I got a real old one with the motor locked up, I may restore it insted of buying a new one.
The motors seem to mostly be ok. It is the wheels break. The axles break. The safety cable breaks. Throttle cable break. We bag and that breaks. Our motors are going for three years. And they are run 6+ hours a day. We started buying the new mowers when the motor wears out on the old ones and swap out the motors.