Well i have a bone stock Raptor well gutted the snorkle out.And had a problem with it missing off idle and real weak in the top of 3,4,and 5 gear.Could not belive it would be lean your the factory BOY WAS I DEAD WRONG!! 140,145, mains went to 150,155 mains and it is anew bike it FLYS like my old LT500 did!!So if you are bone stock you should still jett up!I have the CT kit comeing but could not wait to jett it. SKYDOG