Honda CRF450R 2006 User Manual

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

Honda CRF450R 2006 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore and Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Induction	Keihin 40mm flat-slide carburetor with throttle position sensor (TPS)
Transmission	Close-ratio five-speed
Final Drive	#520 chain; 13T/48T
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	110/90-19
Wheelbase	58.3 inches
Seat Height	37.6 inches
Ground Clearance	13.4 inches
Fuel Capacity	1.9 gallons
Ignition	CDI
Rear Suspension	Pro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and compression damping adjustment separated into low-speed (13 positions) and high-speed (3.5 turns); 12.4 inches travel