2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 156Get this manual
FUEL SYSTEM (After '05) Install the accelerator pump bypass into the float chamberACCELERATOR PUMP BYPASS
Install new O-ring in the float chamber grooveInstall the float chamber onto the carburetor body
FLOAT CHAMBER
Install the hose guides and float chamber screwsTighten the screws to the specified torqueTORQUE: 2.1 N-m {0.2 kgf-m, 1.5 Ibfft)