I've got an 01' raptor with a gytr slip on pipe, K&N filter (not proflow), outerwears, and the flaps cut in the snorkle. I am currently running a 146 and 148 jets. I seem to have a slight sputter at about 3/4 throttle. My air mixture screw has to be out about 4.5 to 5 turns to run well even though there is a slight sputter. Any advice? do i need to go down a size in jets (144 and 146) thanks for any help

Matt

 

i dunno what ur altitude is but thats exactly what im runing in mine for jets and i have a full system on below 3000ft

 

Im between 500-1500 ft and only running a slip on pipe. took the plug out, pretty black with very little tan on the electrode. any additional help would be nice. thanks