i have an 02 660 raptor i put a hmf slip on pipe, the K&N, and the dyno jet kit. I just jetting it over the weekend i took it ridin sunday and it ran like a champ at a high RPM but at low R's its running like ****. And I dont know what to fix theres no holes in the air box. I think it might not be getting anuff fuel at low R's. But i could be wrong can someone give me some ideas on how to fix it.

 

What did you set your fuel mixture screws at? What Main jet size did you use? What is your elevation?