Ym-33277-A/90890-03141 - Yamaha YZ450F 2003 Fahrer- Und Wartungshandbuch

IGNITION TIMING CHECK
IGNITION TIMING CHECK
1. Remove:
Timing plug 1
G
2. Attach:
Timing light
G
Inductive tachometer
G
To the spark plug lead.
Timing light:

YM-33277-A/90890-03141

Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113
3. Check:
Ignition timing
G
Checking steps:
Start the engine and let it warm up. Let the
G
engine run at the specified speed.
Engine speed:
1,900 ~ 2,100 r/min
Visually check the stationary pointer a is
G
within the firing range b on the rotor.
Incorrect firing range → Check rotor and
pickup assembly.
4. Install:
Timing plug
G
3 - 46
INSP
ADJ