Honda CRF450X 2008 Service Manual

Suppon the Tap the valve stems gently with two plastic ham-
cylinder head SD mers as shown to seat the cotters f irmly.
the valve heads do
not contact
anything that may
damage them.
Install the carburetor insulator to the cyl inder head
by al igning the groove of the ca r bureto r insulator
with the tab of the cyli nder h ead.
Tighten the carburetor insulator band screw so the
distance between the band ends is follow:
- '05 - '07: 12.0 ± 1.0 mm (0.47 ± 0.04 in)
-
After '07: 9.0 ± 1.0 mm (0,35 ± 0.04 i n)
Install a new D-ring to the water hose joint .
Install the water hose joint to the cyl inder head.
Install and t ighten the bolt sec ur ely.
CYLINDER HEADIVALVES
'05 - '07:
INSULAT OR Align
After '07:
~ O-RING
12.0 ± 1.0mm
(0.47 ± 0.04 in)
9.0 ± 1 ,Omm
(0.35 ± 0.04 in)
9-35

Honda CRF450X 2008 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore and Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Transmission	5-speed
Final Drive	#520 chain; 13T/51T
Front Suspension	47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	110/100-18
Wheelbase	58.3 inches
Seat Height	37.6 inches
Fuel Capacity	1.9 gallons
Induction	Keihin 40mm carburetor
Ignition	CD with electronic advance
Rear Suspension	Pro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and compression damping adjustment; 12.4 inches travel
Trail	4.6 inches