Yamaha Raptor 90 YFM90RA 2011 Service Manual page 215

EBS01034
2. Ignition spark gap
• Disconnect the spark plug cap from the
spark plug.
• Connect the ignition dynamic spark tester
as shown.
1
Spark plug cap
2
Spark plug
3
• Set the main switch to "ON".
• Measure the ignition spark gap
• 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?
NO
.
a
YES
The ignition system
is OK.
7 - 6
IGNITION SYSTEM
EBS01036
3. Spark plug cap resistance
• Remove the spark plug cap from the spark
plug lead.
• Connect the pocket tester ("Ω × 1k" range)
to the spark plug cap as shown.
• Measure the spark plug cap resistance.
Spark plug cap resistance
5 k Ω at 20 °C (68 °F)
• Is the spark plug cap OK?
YES
ELEC
– +
NO
Replace the spark
plug cap.