Yamaha T135SE Service Manual page 304

EAS00742
4. Ignition spark gap
9Disconnect the spark plug cap from the
spark plug.
9Connect the ignition checker 1 as shown.
2 Spark plug cap
9Set the main switch to "ON".
9Crank the engine by pushing the start switch
and gradually increase the spark gap until a
misfire occurs.
9Measure the ignition spark gap a.
2
Minimum ignition spark gap
6 mm (0.24 in)
9Is there a spark and is the spark gap within
specification?
NO
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Yamaha T135 Service Manual
a
1
YES
The ignition system
is OK.
8-12
IGNITION SYSTEM
EAS00744
5. Spark plug cap resistance
9Remove the spark plug cap from the spark
plug lead.
9Connect the pocket tester ("Ω × 1k" range) to
the spark plug cap as shown.
9Measure the spark plug cap resistance.
Spark plug cap resistance
5 kΩ at 20°C (68°F)
9Is the spark plug cap OK?
YES
ELEC
NO
Replace the spark
plug cap.