sportsman 850 keyway questions

Hey guys I’m thinking about buying a motor from a guy at a local shop.
He says the motor is pristine and has 23hrs on it.

It came in for warranty work and they decided to swap the whole motor instead of fixing it.

My question to you is that he is telling me it came in running and the only thing that was wrong with it was the keyway in the flywheel was sheared and that all I would have to do is swap my flywheel and keyway over from my existing motor.

Is there any concerns from that keyway breaking mess up internals or should I be fine?