Honda CRF450X 2006 Service Manual

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Attach a tachometer according to its manufacture 's
instructions.
Read the
instruction for timing light operation.
Start the engine and
hold it at 1,800 ± 100 rpm while
pointing the timing light towards the index notch.
The
ignition timing is correct if the "F" mark on the
flywheel aligns with the index notch in the left
crankcase
cover .
Check
that the O-ring is in good condition, replace it
if necessary.
Apply oil to the O-ring and install it onto the timing
hole cap.
App ly grease to the timing hole cap threads.
Install the timing hole cap and tighten it to the spec-
ified torque.
TORQUE:
10 N'm 11.0 kg f·m. 7 Ibf· ftl
THROTTLE POSITION SENSOR
INSPECTION
Remove the fuel tank (page 3-8).
Disconnect the throttle pOSition sensor 3P (Black)
connector.
Measure
the resistance between the Blue and Black
wire terminals of the sensor side connector.
Check that the resistance between the Yellow and
Black
wire terminals varies with the throttle position
while operating the throttle grip.
Fully closed-Fully open pos iti on:
IGNITION SYSTEM
3P (BLACK) CONNECTOR
••
BLUE YELLOW
Resistance incr eases BLUE
Fully open-Fully clo se d pos iti on:
Resistance decreases
If both measurements are abnormal, replace the
throttle position sensor (page 6-26).
BLACK
BLACK
18-9
,.-

Honda CRF450X 2006 Specifications

General

Displacement	449 cc
Bore x Stroke	96.0 mm x 62.1 mm
Compression Ratio	12.0:1
Transmission	5-speed
Final Drive	#520 chain; 13T/51T
Front Brake	Single 240 mm disc with twin-piston caliper
Rear Brake	Single 240 mm disc
Front Tire	80/100-21
Rear Tire	110/100-18
Wheelbase	58.3 inches
Engine Type	Liquid-cooled single-cylinder four-stroke
Fuel System	Keihin 40mm flat-slide carburetor
Valve Train	Unicam, 4-valve
Induction	Keihin 40 mm flat-slide carburetor with Throttle Position Sensor (TPS)
Ignition	CD with electronic advance
Front Suspension	47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
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