My snowblower has never thrown snow very far. I replaced the impeller belt with a new belt and adjusted the tension so at idle, the impeller actually spins very slowly. I engage impeller using handle lever and impeller certainly spins fast but the machine still throws snow very poorly. Motor runs great, idles fine, no surging or anything. Motor is fine. What's up with crappy throwing? It's a 7hp, 24 inch cut 2 stage unit.