I've got a 2004 KDX 200 and is battling to get the the bike running from bottom to top end. On low revs it would'nt perform! Standard jetting at sea level for this model I believe is main 160 and slow 48. What else can be wrong? On tops it performs well but gets worse from mid to bottom. The bike is stock standard, no pipes, filters or performance reeds. I've checked the reed but they're fine. The bike was stored away for some time. I've cleaned the carb and drained the tank for new mixture, 40:1. Please help!