Re: Is having a worn rear sprocket bad?
The rear is definitely done. The front isn't looking to good either. You should really do both and the chain. You can typically pick up the entire set-up for well under $200. Check Cal-Sportbike, they are a site sponsor and give great prices and good service.
If it has wheels, I've crashed it, and some things that don't razor scooter, skate board, roller skates, roller blades, skis, snowmobile, card board box on stairs, giant inner tube, nissan sentra, dirtbike, lawn tractor (wheelied it over), grandmas bread tray on stairs, kayak, canoe, rubber raft, bicycle, wake board, kneeboard, waterskis, tobaggan (plowed a pine tree), horses, ATV's