Yamaha WR250FR Owner's Service Manual page 113

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IGNITION TIMING CHECK
2. Attach:
• Timing light
• Inductive tachometer
1
3. Check:
• Ignition timing
Checking steps:
• Start the engine and let it warm up. Let the
engine run at the specified speed.
• Adjust the engine idling speed.
Refer
ADJUSTMENT" section.
• Visually check the stationary pointer a is
within the firing range b on the rotor.
Incorrect firing range → Check rotor and
pickup assembly.
4. Install:
• Timing mark accessing screw
3 - 48
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INSP
ADJ
To the ignition coil lead (orange lead 1).
Timing light:
YM-33277-A/90890-03141
Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113
to
"ENGINE
IDLING
SPEED

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