Yamaha PW50W 2007 Service Manual page 156

3. 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
5.0 kΩ at 20°C (68°F)
9Is the spark plug cap OK?
YES NO
Replace the spark
plug cap.
7-6
IGNITION SYSTEM
4. Ignition coil resistance
9Disconnect the ignition coil connector from
the ignition coil terminal.
9Connect the pocket tester ("Ω × 1" range)
to the ignition coil as shown.
Positive tester probe
Negative tester probe →
2
1
9Measure the primary coil resistance.
Primary coil resistance
0.32–0.48 Ω at 20°C (68°F)
9Connect the pocket tester ("Ω × 1k" range)
to the ignition coil as shown.
Negative tester probe → terminal 1
Positive tester probe →
1
2
9Measure the secondary coil resistance.
Secondary coil resistance
5.68–8.52 kΩ at 20°C (68°F)
9Is the ignition coil OK?
YES
ELEC
→ →
terminal 1
ignition coil base 2
spark plug lead 2
NO
Replace the ignition
coil.