2004-2005 Yamaha YFZ 450

Main Jet        Needle    Clip position    Pilot    Air/Fuel screw

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

2006-2008 Yamaha YFZ 450

Main Jet    Needle    Clip position    Pilot    Air/Fuel screw

172              NCVQ      4th from top      45       2.5 turns out f/ closed

2004-2005 Honda TRX 450R

Main Jet    Needle    Clip position    Pilot    Air/Fuel screw

190              hrc           3rd from top  stock   2 turns out f/ closed

2006-2008 Honda TRX 450R

Main Jet    Needle    Clip position    Pilot    Air/Fuel screw

175             NCVQ      4th from top    stock  2.5 turns out f/ closed

These settings are good point to start at, and is intended for use at approximately sea level, low humidity, 80 degrees, high flow exhaust system, high flow filter, and the stock air box lid removed. If you have any questions about your specific situation, please feel free to email or just give us call.