Yamaha YFZ450S 2003 Service Manual page 334

EBS01034
For USA and CDN
4. Ignition spark gap
• Disconnect the ignition coil from the spark
plug.
• Connect the dynamic spark tester 1 as
shown.
2 Ignition coil
• Set the main switch to "ON".
• Measure the ignition spark gap a.
• Crank the engine by pushing the start
switch and gradually increase the spark
gap until a misfire occurs.
Minimum ignition spark gap
6 mm (0.24 in)
• Is there a spark and is the spark gap within
specification?
NO
YES
The ignition system
is OK.
IGNITION SYSTEM
EBS01034
For Europe and Oceania
4. Ignition spark gap
• Disconnect the ignition coil from the spark
plug.
• Connect the ignition checker 1 as shown.
2 Ignition coil
• Set the main switch to "ON".
• Measure the ignition spark gap a.
• Crank the engine by pushing the start
switch and gradually increase the spark
gap until a misfire occurs.
Minimum ignition spark gap
6 mm (0.24 in)
• Is there a spark and is the spark gap within
specification?
8 - 11
ELEC
NO
The ignition system
is OK.
– +
YES