2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 135Get this manual
FUEL SYSTEM ('04'05) Install the SE valve into the carburetor body and tighten the valve nutTORQUE: (0.3 kgfm, 2.2 Ibfft)
Hook the choke lever to the SE valve end and install it onto the carburetor body with the collar and screwTighten the screw securely
AIR CUT-OFF VALVE
Install new O-rings onto the slow air jetInstall the slow air jet into the air cut-off valve with the stepped side facing the valve sideInstall new O-ring onto the air cut-off valve and install the valve onto the carburetor body