Just bought a 2001 Raptor 660. Would like some jetting info. The motor is all stock except for a FMF powerbomb header, powercore 4 muffler, a twin air Dual stage powerflow filter kit, and no air box lid. Just wondering what mains, pilot jets, fuel screw adjustment, and position of needles. Is it worth upgrading to a jet kit with different needles, or are the needles not a big gain?