Honda CRF450R 2006 Owner's Manual page 128

Carburetor Adjustments & Tuning Tips
5. Remove the accelerator pump cover screws
(10) and accelerator pump cover (11).
(10)
(11)
(10) accelerator pump cover screws
(11) accelerator pump cover
6. Remove the O-rings (12), spring (13) and
diaphragm (14).
Clean the diaphragm.
(14)
(12) O-rings (14) diaphragm
(13) spring
124
Adjustments for Competition
7. Remove the holder screw (15), throttle stop
screw holder (16), float bowl screws (17),
tube guides (18) and float bowl (19).
(17)
(15) holder screw
(16) throttle stop screw holder
(17) float bowl screws
(18) tube guides
(19) float bowl
8. Remove the pump rod (20).
Clean the pump rod and rod passage (21).
Install the pump rod into the link lever (22).
(12)
Push the rod forcibly into the link lever until
it snaps into place.
(13)
(22)
(20) pump rod
(21) rod passage
(15)
(16)
(19)
(18)
(21)
(21)
(22)
(20)
(22) link lever
9. Measure the float level (23) with the float
level gauge (24) during float tab just
contacting the float valve and the carburetor
intake (25) 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.
(25)
(23) float level
(24) float level gauge
(25) carburetor intake
10. Remove the leak jet (26) from the float bowl
(19).
Clean the leak jet.
(19)
(19) float bowl (26) leak jet
(23)
(24)
(26)