2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 155Get this manual
FUEL SYSTEM (After '05) Hang the float valve onto the float arm lipInstall the float with the float valve and insert the float pinInstall the float pin in position as shown by tapping it with suitable driver (O.D mm)0.5 0.3 mm (0.02+ 0.01 in) FLOAT PIN FLOAT VALVE
Set the float level gauge so it is perpendicular to the float chamber face and in-line with the main jetSet the carburetor so the float valve just contacts the float arm lipMake sure the float valve tip is securely in contact with the valve seatMake sure the float is level with the float level gaugeTOOL: Carburetor float level gauge Float level: 8.0 mm (0.31 in) If the float level is out of specification, adjust it by bending the lipSet the return spring to the push rod link leverInstall the push rod link lever, washer and E-clipTurn the push rod link lever and check for smooth operation07401-0010000