1. Check:
- Primary coil resistance
Out of specification → Replace.
Primary coil resistance: 1.19-1.61Ω at 20°C (68°F)
a. Disconnect the ignition coil leads from the wire harness.
b. Connect the pocket tester (Ωx1) to the ignition coil as shown.
Pocket tester: 90890-03112.
Analog pocket tester: YU-03112-C.
Positive tester probe: Ignition coil terminal
Negative tester probe: Ignition coil terminal
![](https://motoinstruction.ru/img/yamaha/3/112299.jpg)
c. Measure the primary coil resistance.
2. Check:
- Secondary coil resistance
Out of specification → Replace.
Secondary coil resistance: 8.5-11.5 kΩ at 20°C (68°F)
a. Disconnect the ignition coil leads from the wire harness.
b. Connect the pocket tester (Ωx1k) to the ignition coil as shown.
Pocket tester: 90890-03112.
Analog pocket tester: YU-03112-C.
Negative tester probe: Ignition coil terminal «1»
Positive tester probe: Spark plug terminal «2»
![](https://motoinstruction.ru/img/yamaha/3/112300.jpg)
c. Measure the secondary coil resistance.
3. Check:
- Ignition spark gap «a»
Out of specification → Replace.
Minimum ignition spark gap: 6.0 mm (0.24 in)
a. Disconnect the spark plug cap from the spark plug.
b. Connect the ignition checker/dynamic spark tester «2» as shown.
Ignition checker: 90890-06754.
Opama pet-4000 spark checker: YM-34487.
![](https://motoinstruction.ru/img/yamaha/3/112301.jpg)
1. Spark plug cap
c. Set the main switch to «ON».
d. Measure the ignition spark gap «a».
e. Crank the engine by pushing the starter switch and gradually increase the spark gap until a misfire occurs.