Yamaha YFZ 450

Main Jet    Needle    Clip position    Pilot    Air/Fuel screw

175           NCVQ      4th from top    45     2.5 turns out from closed

These recommendations are good starting points that are intended for use at approximately sea level, 80 degrees, low humidity, with Sparks Exhaust system, Sparks Air SuperCharger kit, and the stock air box lid removed. If you have any questions about your specific situation, please call us! 661-872-4343 Monday - Friday 8:30 - 5:30 PST