Thanks fly wheel and starter teeth look fine. Next step it checking the voltage battery is only a year old.depends how they fail. If the teeth are all knocked off then it could be the flywheel. If they are burning up check the battery voltage. It may be low. Motors use more current when voltage is low.
Thanks that’s my next step,And check the voltage between the starter + and the engine then between the starter + and the battery - , both with the starter cranking
They should be the same, if not battery leads need attention or even replacement .