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Make sure the gearbox is in neutral. Also, before diagnosing, make sure that the fuse has not blown and the battery is fully charged.
Troubleshooting
No spark or weak ignition spark:
Check connections in the ignition system for poor connections. → Poor contact → Poor contact in connections.
Serviceable:
Measure the supply voltage between the wires (B/O and B/W) switch (CDI) with the ignition on. → Incorrect → The ignition switch is faulty; A break in the wiring or poor contact in the ignition circuit connections.
Correct:
Measure the peak voltage at the primary winding of the ignition coil (6-16):
Note. Measuring the peak voltage on the primary winding of the ignition coil is only possible with a multitester and a peak voltage adapter.
Correct:
Check the spark plug (2-9) → OK → Poor spark plug connection.
Faulty → The spark plug is faulty.
Incorrect:
Check the ignition coil (6-17) → Faulty → The ignition coil is faulty.
Serviceable:
Measure the peak voltage and resistance at the sensor and signal windings (6-17):
Note. Measuring the peak voltage on the sensor winding and signal winding is only possible with a multitester and a peak voltage adapter.
Incorrect → The sensor winding is faulty; The signal winding is faulty.
Correct → Switch is faulty (CDI); Open circuit in the electrical wiring; Poor contact in ignition connections.