Carburetor Assembly - Honda CRF450X 2017 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 0.31 in (8.0 mm).
If the float level is out of specification, adjust
it by bending the float tab carefully.
(26)
(24) fl oat level
(25) fl oat 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)
(28)
(16) fl oat bowl
(27) leak jet
(28) O-ring
17 CRF450X̲31MEY710.indb 139 17 CRF450X̲31MEY710.indb 139

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:
(24)
0.2 lbf·ft (0.3 N·m, 0.03 kgf·m)
float bowl screws:
1.5 lbf·ft (2.1 N·m, 0.2 kgf·m)
accelerator pump cover screws:
1.5 lbf·ft (2.1 N·m, 0.2 kgf·m)
carburetor top cover bolts:
1.5 lbf·ft (2.1 N·m, 0.2 kgf·m)
jet needle/holder assembly:
(25)
1.5 lbf·ft (2.1 N·m, 0.2 kgf·m)
link arm torx screw:
1.5 lbf·ft (2.1 N·m, 0.2 kgf·m)
throttle drum cover bolt:
2.5 lbf·ft (3.4 N·m, 0.3 kgf·m)
hot start cable nut:
1.5 lbf·ft (2.1 N·m, 0.2 kgf·m)
throttle cable lock nut:
3.0 lbf·ft (4.0 N·m, 0.4 kgf·m)
throttle cable bolt:
(27)
3.0 lbf·ft (4.0 N·m, 0.4 kgf·m)
shock absorber upper mounting nut:
32 lbf·ft (44 N·m, 4.5 kgf·m)
• Tighten the insulator band screw (1) so the
insulator band distance is 0.5 ± 0.04 in (12 ±
1 mm).
• 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.
Carburetor Adjustment & Tuning Tips
• 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.
(1)
(1) insulator band screw
(3)
(4)
(2) throttle cables
(3) hot start cable
(4) throttle position sensor connector
Adjustments for Competition
0.5 ± 0.04 in
(12 ± 1 mm)
(2)
139
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