Well here is what I can tell you. I am running the aFe airbox, and am running the DynoJet needles with the clips at position two, DynoJet 155 and 160 main jets, and the screws backed out three full turns. Once our exhaust comes in and I install it, the machine will go down to be tuned on the Dyno. Maybe go one size larger than me seeing as you have the exhaust. Keep in mind, those are DynoJet main jets, therefore, the numbers are different then Keihin.
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2008 Kawasaki Teryx | 840cc BBK w/ stage III cams | FST long travel and HD steering | Twisted Stitch seats | FST cage | Muzzy dual exhaust | Dynatek prog CDI | aFe intake | HiPer carbon fiber beadlocks | Goodyear MT/Rs | Crow restraints | SafeGlo LED and FO whips | NightOwl HID conversion | Edge series 40" LED lightbar | Fuego Dual HID lights | Dalton clutch kit and OD cover | Full audio | Navigation | Power steering | TrailTech Vapor computer | Factory UTV skids | Airtite Art custom paint | Maier plastics