Yamaha MT-03 Service Manual page 382

c. Measure the primary coil resistance.
2. Check:
• Secondary coil resistance
Out of specification
Secondary coil resistance
10.4-15.6 kΩ at 20 °C (68 °F)
a. Disconnect the spark plug cap from the igni-
tion coil.
b. Connect the pocket tester (Ω x 1k) to the ig-
nition coil as shown.
Pocket tester
90890-03112
• Positive tester probe
• Negative tester probe
c. Measure the secondary coil resistance.
ET5YU1032
CHECKING THE IGNITION SPARK GAP
1. Check:
• Ignition spark gap
Out of specification
system troubleshooting, starting with step 5.
Refer to "TROUBLESHOOTING" on page
8-3.
Replace.
red/black "1"
spark plug lead "2"
Perform the ignition
8-55
ELECTRICAL COMPONENTS
Minimum ignition spark gap
6.0 mm (0.24 in)
NOTE:
If the ignition spark gap is within specification,
the ignition system circuit is operating normally.
a. Disconnect the spark plug cap "2" from the
spark plug.
b. Connect the ignition checker "1" as shown.
Ignition checker
90890-06754
2. Spark plug cap
c. Turn the main switch to "ON" and engine
stop switch to "I".
d. Measure the ignition spark gap "a".
e. Crank the engine by pushing the start switch
"J" and gradually increase the spark gap
until a misfire occurs.
EAS28120
CHECKING THE CRANKSHAFT POSITION
SENSOR
1. Disconnect:
• Crankshaft position sensor coupler
(from the wire harness)
2. Check:
• Crankshaft position sensor resistance
Out of specification
shaft position sensor.
Crankshaft position sensor
resistance
192-288 Ω at 20 °C (68 °F)/
blue/yellow-green/white
Replace the crank-