Yamaha WR450F 2005 Manuel D'atelier Du Proprietaire page 294

IGNITION TIMING CHECK
1
1
IGNITION TIMING CHECK
1. Remove:
• Timing plug 1
2. Attach:
• Timing light
• Inductive tachometer
To the ignition coil lead (orange lead 1).
Timing light:
YM-33277-A/90890-03141
3. Adjust:
• Engine idling speed
Refer to "IDLE SPEED ADJUSTMENT".
4. Check:
• Ignition timing
Visually check the stationary pointer a is
within the firing range b on the rotor.
Incorrect firing range → Check rotor and
pickup assembly.
5. Install:
• Timing plug
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INSP
ADJ