Honda CRF450X 2008 Service Manual

GENERAL INFORMATION
FUEL SYSTEM
ITEM
O' TV
THREAD TORQUE
REMARKS
DIA. (mm)
N'm (k gf 'm, Ibf·ftl
Throttle drum cover bolt
1 5 3.4 (0.3, 2.5)
Needle jet
1 7 1.8 (0.2, 1.3)
Main jet
1 5 1.5 (0.2, 1. 1)
Slow jet
1 10 1.5 (0.2, 1.1)
Slow air je t ('05 - '07)
1 5 0.9 (0. 1, 0.7)
"
Starter jet
1 5 1.5 (0.2, 1,1)
Ace. pump bypass
1 4 0.3 (0.03, 0.2)
,
Carbur etor t op cover bo lt
2 4 2.1 (0.2, 1.5)
Thr ottle shaft screw
('OS, '06)
1 4 2.1 (0.2, 1.5)
NOTE 2
Throttle shaft torx screw (After '06)
1 4
2.1 (0.2, 1.5)
NOTE 2
Float chamber screw
4 4
2.1 (0.2, 1.5)
Accelerator pump cover screw
3 4
2.1 (0.2, 1.5)
Carbur eto r drain plug
1 18
4.9 (0.5, 3.6)
Carburetor drain screw (After '05)
1 6
1.5 (0.2, 1.1)
Choke valve lock nut
1 12
2.1 (0.2, 1.5)
'.
Hot start valve lock nut
1 12
2.1 (0.2, 1. 5)
Needle holder
1 8
2.1 (0.2, 1.5)
Throttle position sensor torx screw (,05, '06)
1 5
3.4 (0.3, 2.5)
Throttle position
se n sor bolt (After '06)
1 5
3.4 (0.3, 2.5)
COOLING SYSTEM
ITEM
O' TV
THREAD TORQUE
REMARKS
DIA. (mm)
N'm (kgf'm, Ibf.ft)
Water pump im peller 1 7 12 (1.2, 9)
ENGINE REMOVAl/INSTALLATION
ITEM
OTI
THREAD
TORQUE
REMARKS
DIA. lmmJ N'm (kgf'm , Ibf ·tt)
Drive sprocket bolt 1 8
31 (3.2, 23)
CYLINDER HEADIVALVES
ITEM
O' TV
THREAD TORQUE
REMARKS
DIA. lmm )
N'm (kgf'm, Ibf.ftJ
Cylinder
head cover bolt
3 6
10 (1.0, 7)
Camshaft holder mounting bolt 4 6
14 (1.4, 1 0) NOTE 1
Decompressor lifter
arm mounting
ou1
('05 - '07)
1 8
22 (2.2, 16) NOTE 1
Decompressor cam
mounting bolt
('05
- '07)
,
8
24 (2.4, 18) NOTE 1
Cylinder head nut 4 10 66 (6.7, 49) NOTE 1
Cam sprocket bolt 2
7 20 (2.0, 15) NOTE 2
CYLINDER/ PISTON
ITEM
O' TV
THREAD TORQUE
REMARKS
DIA. (mml N'm (kgf.m, Ibf · tt)
Cam chain tensioner lifter mo unting bo lt 2 6 12 1 1.2 , 9)
Cylinder stud bolt 4 - -
See page '·17
CLUTCH/STARTER CLUTCH/ KICKSTARTER/GEARSHIFT LINKAGE
ITEM O' TV
THREAD
TORQUE
REMARKS
DIA .( mm)
N'm (kgf'm, tbf· tt )
Gearshift drum center pin 1
8
22 (2.2, 16) NOTE 2
Gearshift
drum stopper arm bolt 1 6 12 ( 1.2, 9)
Clutch center lock nut 1 18
SO (S . 2, 59) NOTE 1
Clutch spring bolt 6 6
12 ( 1. 2, 9)
Gearshift return spring
pin 1 8
22 (2.2, 16)
l
Gearshift pedal pinch bolt 1 6
12(1.2,9 )
Kickstarter
pedal bolt 1 8
3S (3.9, 28)
Primary drive gear bolt 1
12 108 (11.0, 80)
NOTE
1
Starter gear holder mounting bolt 3
7 18 (1.8, 13) NOTE 1
1-15

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