Yamaha XP500 Service Manual page 489

EAS00743
4. Ignition spark gap
The following procedure applies to all of the
spark plugs.
• Disconnect the spark plug cap 1 from the
spark plug.
• Connect the ignition checker 2 as shown.
• Set the main switch to "ON".
• Measure the ignition spark gap a.
• Crank the engine by pushing the starter
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?
YES
NO
The ignition system
is OK.
IGNITION SYSTEM
EAS00745
5. Spark plug cap resistance
The following procedure applies to all of the
spark plug caps.
• Remove the spark plug cap from the spark
plug lead.
• Connect the pocket tester (Ω × 1k) to the
spark plug cap as shown.
• Measure the spark plug cap resistance.
Spark plug cap resistance
10.0 kΩ at 20 °C (68 °F)
• Is the spark plug cap OK?
8 - 11
ELEC
YES
Replace the spark
plug cap.
– +
NO