My good bud, just bought a 2004 Raptor . With a T4 exhaust from some guy in WI....

Just a Quick question what should the jetting be . Thats the only question apperciate the help.

 

With dyno jet I would say a 146 and a 148 with no lid on the airbox, and the needles on the third clip from the top. With GYTR jet kit or mikuni jets I would say a 160 and 165 with needles in the same spot. With a lid I would go with probably go 144 and 146 with dyno jet and 155 and 160 with mikuni/GYTR the the air fuel screws at 3 turns on the left carb and 2 turns on the right carb. try that and see how it runs.

 

I live at 500 feet above sea level and my jetting is 144-146 with the Lid off and I have 25 pilot jets. That is Dynojet...and that is there recommendation for 0-3000 feet above.