Yamaha YZ450F Owner's Service Manual page 122

2. Attach:
• Timing light "1"
• Digital tachometer "2"
To the high tension code "3".
Timing light
90890-03141
YU-03141
Digital tachometer
90890-06760
YU-39951-B
1
3. Adjust:
• Engine idling speed
Refer to "ADJUSTING THE ENGINE
IDLING SPEED" on page 3-16.
4. Check:
• Ignition timing
Check whether the alignment mark "a" on
the left crankcase cover is within the firing
range "b" on the rotor.
Incorrect firing range  Check rotor and
Crankshaft position sensor.
b
5. Install:
• Timing mark accessing screw
Timing mark accessing screw
6 Nm (0.6 m·kgf, 4.3 ft·lbf)
2 3
a
3-38
ELECTRICAL SYSTEM