You need a sprag clutch but before you order pull your side cover off. Take off the single big nut and washer....THEN your gonna have to order a flywheel puller( not expensive) ok after magneto pops off on the inside is where your problem is. Should be eight smaller bolts holding a gear to the mag, four of which hold a sprag cradle/housing. Mine was all chewed up and barings were all over the place/ . Now behind the mag and gear you have large starter gear/flywheel. You wanna check the outcroped landing inwhich the sprag rose on. It can’t have any livers or to many dings or problem will repeat itself if not worse. You can find a sprag for as little as twenty or the flywheel and sprag for like a hundred. Make sure you follow tork specs and use lock tight when putting things back together.