Reply To: Hyosung GV250 slow electric start, bump-starts fine — starter clutch diagnosis
Yes, because the woodruff key is needed to lock the rotor. You can feel how heavy it is don’t you!
So if it was missing or broken, you would also have “ROUGH” running as its not spinning properly which could eventually lead to a catastrophic failure.
Make sure the NUT is good otherwise get a new serrated nut that or metal-lock insert nut and use RED LOCTITE on the threads after replacing the woodruff key.
Any Hyosung 250 will have the same size or message local breakers for a much quicker acquisition of that part.  Get a spare engine if you have to and its a good backup to have for the future 🙂