Honda TRX450R Service Manual page 133

FUEL SYSTEM ('04 - '05)
THROTTLE VALVE
Install the needle clip on the jet needle.
STANDARD CLIP POSITION: 3rd groove from top
Install the jet needle into the throttle valve.
Install the link arm into the throttle valve and tighten
the two screws.
Install the throttle valve assembly into the carbure-
tor body, being careful not to damage the jet nee-
dle.
Set the thrust washer between the throttle valve link
arm and carburetor body (throttle drum side).
Install the return spring between the carburetor
body and throttle drum link arm.
Insert the link arm shaft through the drum link arm,
return spring, carburetor body, thrust washer and
valve link arm while hanging the spring ends as
shown.
Align the screw holes in the link arm and shaft,
install the spring washer and screw, and tighten the
screw securely.
Turn the throttle drum and check for smooth opera-
tion.
Make sure that the clearance between the drum link
arm and shaft is 0.1 -0.3 mm (0.004-0.012 in).
Adjust the clearance by opening or closing the slot
in the drum link arm.
THROTTLE VALVE
NEEDLE CLIP
JET NEEDLE
LINK ARM THROTTLE VALVE
SCREWS
LINK ARM SHAFT
0.01 ±0.03 mm
(0.004 ±0.012 in)
ADJUSTING SLOT I DRUM LINK ARM
7-18