Yamaha XF50W Service Manual page 293

EAS00742
4. Ignition spark gap
Disconnect the spark plug cap from the spark
plug.
Connect the ignition checker 1 as shown.
2Spark plug cap
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?
NO
*
The ignition system is
OK.
YES
ft
8-11
IGNITION SYSTEM
EAS00744
5. Spark plug cap resistance
• Remove the spark plug cap from the spark
plug lead.
• Connect the pocket tester
to the spark plug cap as shown.
• Measure the spark plug cap resistance.
a
Spark plug cap resistance
4~6 k at 20°C(68°F)
• Is the spark plug cap OK?
YES
V
EAS00746
6. Ignition coil resistance
• Disconnect the ignition coil connectors from
the ignition coil terminals.
• Connect the pocket tester
tion coil as shown.
Positive tester probe
Negative tester probe
("Q x1k" range)
NO
4
Replace the spark plug
cap.
(Q x1) to the igni-
-» orange ®
-> red/black