Yamaha XT250X - Checking the Spark Plug; Checking the Ignition Timing

ENGINE
3-8
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Handlebar side
a. Loosen the locknut “1”.
b. Adjust the play of throttle cable by turning the
adjusting nut “2” in direction “a” or “b”.
c. Tighten the locknut.
WARNING
EWA12920
After adjusting the throttle cable free play,
start the engine and turn the handlebars to
the right and to the left to ensure that this
does not cause the engine idling speed to
change.
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EAS20690
CHECKING THE SPARK PLUG
1. Disconnect:
● Spark plug cap
2. Remove:
● Spark plug
CAUTION:
ECA13330
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from falling
into the cylinder.
3. Check:
● Spark plug type
Incorrect → Change.
4. Check:
●
Electrode “1”
Damage/wear → Replace the spark plug.
● Insulator “2”
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
●
Spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
● Spark plug gap “a”
(with a wire thickness gauge)
Out of specification → Regap.
7. Install:
● Spark plug
NOTE:
Before installing the spark plug, clean the spark
plug and gasket surface.
8. Connect:
● Spark plug cap
EAS20700
CHECKING THE IGNITION TIMING
NOTE:
Before checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure all connections are tight and free of
corrosion.
1. Remove:
● Timing mark accessing screw “1”
Direction “a”
Increases the throttle cable play.
Direction “b”
Decreases the throttle cable play.
Manufacturer/model
NGK/DR7EA
1
a
2
b
Spark plug gap
0.6–0.7 mm (0.024–0.028 in)
Spark plug
18 Nm (1.8 m•kg, 13 ft•lb)
T
R
.
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