2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 88Get this manual
FUELSVSTEM TIghten the assembly screws securelyTHI'O"rTf VALVE ARM
Inslall the throula valve IIIsembly and washer 10 the carburetor bodyInstall the spring and shaft to the carbureto and tighten the throttle valve arm set screw securely