1. Weak Battery: Even though your battery may show a full charge, it may not be able to provide the necessary amperage to crank the engine. Try jump-starting the motorcycle using another battery to see if this resolves the issue.
2. Faulty Starter Motor: If the starter motor is not functioning correctly, it may not be able to engage the engine properly, resulting in a rapid clicking sound. Inspect the starter motor for any damage or loose connections.
3. Bad Starter Solenoid: The starter solenoid is responsible for engaging the starter motor with the engine. If the solenoid is faulty, it may not be able to send the necessary power to the starter motor, causing the clicking sound. Check the solenoid for any damage or loose connections.
4. Corroded or Loose Wiring: Check all the wiring connections related to the battery, starter motor, and solenoid for any signs of corrosion or loose connections. Clean any corroded terminals and tighten any loose connections.
5. Bad Ground Connection: Ensure the motorcycle frame and engine have a good ground connection. Clean any paint or rust from the contact points to improve the grounding.
If the problem persists after checking and addressing the above potential causes, it's recommended to consult with a professional mechanic or refer to a more comprehensive troubleshooting guide for your specific motorcycle model.