:welcome:
Kohler us the same fywheel casting on just about everything they made this century
The Courage engines had a thicker crank so the hole is bigger and they will not fit
The Courage flywheels come with a few different magnet layouts which will affect the charging.
Got a funny feeling the teeth are cast in on Kohlers but I could be wrong.
If all the teeth are worn off yours there is a problem with your starter.
The teeth of the starter are softer than the teeth on the flywheel so the easily replaceable ear on the starter motor is the one usually replaced.