Yamaha XF50W Service Manual page 294

• Measure the primary coil resistance.
a
Primary coil resistance
2.16 ~ 2.64
• Connect the pocket tester
nition coil as shown.
Negative tester probe g orange 2
Positive tester probe g spark plug lead 1
• Measure the secondary coil resistance.
m
Secondary coil resistance
8.64 ~ 12.96 k
• Is the ignition coil OK?
4
YES
Replace the ignition coil.
at 20°C(68°F)
(£1 x1k) to the ig-
at 20°C(68°F)
4
NO
8-12
IGNITION SYSTEM
EAS00748
7. Crankshaft position sensor resistance
• Disconnect the crankshaft position sensor
coupler from the wire harness.
• Connect the pocket tester
crankshaft position sensor coupler
shown.
Positive tester probe g white/red 1
Negative tester probe g white/blue2
• Measure the crankshaft position sensor re-
sistance.
SI
Crankshaft position sensor resis-
tance
248 ~ 372
(between white/red and white/
blue)
• Is the crankshaft position sensor OK?
4
YES
EAS00749
8. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
YES
(£2 x100) to the
as
at 20°C(68°F)
I
NO
Replace the crankshaft
position sensor/stator
assembly.
NO
Replace the main
switch.