i agree with daswulf on the champion #400. that was there flagship line of blowers. when you go to look at it, bring some chainsaw bar oil. if it makes any grinding sounds, try oiling it and seeing if it helps.it could just be that it is dry. after that, if it makes any other sound than a soft wurr, i wouldn't mess with it. like TP said, you don't want to get tangled up in gear replacement.