Carburetor Assembly - Honda 2009 CRF450X Owner's Manual & Competition Handbook

10.Measure the float level (24) with the float
level gauge (25) during float tab is just
contacting the float valve and the carburetor
intake (26) facing up. The float level should
be 8.0 mm (0.31 in).
If the float level is out of specification, adjust
it by bending the float tab carefully.
(24)
(26)
(24) float level
(25) float level gauge
(26) carburetor intake
11.Remove the leak jet (27) and O-ring (28) from
the float bowl (16).
Clean the leak jet.
(16)
(27)
(28)
(16) float bowl
(27) leak jet
(28) O-ring

Carburetor Assembly

To assemble, reverse the disassembly procedures.
To install the carburetor, reverse the removal
procedures.
Tighten the following parts to the specified torque.
leak jet:
0.3 N·m (0.03 kgf·m, 0.2 lbf·ft)
float bowl screws:
2.1 N·m (0.2 kgf·m, 1.5 lbf·ft)
accelerator pump cover screws:
2.1 N·m (0.2 kgf·m, 1.5 lbf·ft)
carburetor top cover bolts:
2.1 N·m (0.2 kgf·m, 1.5 lbf·ft)
jet needle/holder assembly:
2.1 N·m (0.2 kgf·m, 1.5 lbf·ft)
link arm torx screw:
(25)
2.1 N·m (0.2 kgf·m, 1.5 lbf·ft)
throttle drum cover bolt:
3.4 N·m (0.3 kgf·m, 2.5 lbf·ft)
hot start cable nut:
2.1 N·m (0.2 kgf·m, 1.5 lbf·ft)
throttle cable lock nut:
4.0 N·m (0.4 kgf·m, 3.0 lbf·ft)
throttle cable bolt:
4.0 N·m (0.4 kgf·m, 3.0 lbf·ft)
shock absorber upper mounting nut:
44 N·m (4.5 kgf·m, 32 lbf·ft)
• Tighten the insulator band screw (1) so the insulator
band distance is 12 ± 1 mm (0.5 ± 0.04 in).
• Route the throttle cables (2), hot start cable (3)
and throttle position sensor wire correctly.
• After installing the carburetor, adjust the throttle
grip freeplay and hot start lever freeplay.
• After installing the carburetor, check the throttle
position sensor connector (4) for correct routing.
• After installing the carburetor, check the air vent
hoses (5) and overflow hose (6) for kinking or
pinching and correct routing.
• After connecting the fuel line (7), check the fuel
line clamps (8) as illustrated (next page).
• Check that the U-ring and O-ring are in good
condition. Replace them if necessary.
Carburetor Adjustment & Tuning Tips
(1)
(1) insulator band screw
(3)
(4)
(2) throttle cables
(3) hot start cable
(4) throttle position sensor connector
Adjustments for Competition
HONDA O/M CRF450X (Eu) 3RMEY620 00X3R-MEY-6200 HONDA O/M CRF450X (Eu) 3RMEY620 00X3R-MEY-6200
12 ± 1 mm
(0.5 ± 0.04 in)
(2)
139