Yamaha T135SE Service Manual page 304

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