There could be several potential reasons why both the self-start and kick-start mechanisms of your Yamaha FZS motorcycle are not working. Here are a few possibilities to consider:
Battery Issues: If the battery is weak or discharged, it can prevent the self-start mechanism from functioning properly. Similarly, a weak battery may not provide enough power for the ignition system to work with the kick-start.
Faulty Starter Motor: The starter motor is responsible for initiating the self-start mechanism. If it's defective or damaged, it may not engage properly, resulting in a non-functional self-start.
Electrical Problems: Faulty wiring, loose connections, or a blown fuse can disrupt the electrical system and prevent both the self-start and kick-start from functioning as expected.
Ignition System Problems: Issues with the ignition system, such as a faulty ignition switch, ignition coil, or spark plug, can hinder the starting process, affecting both the self-start and kick-start mechanisms.
Fuel Delivery Problems: Insufficient fuel supply, clogged fuel lines, or a faulty fuel pump can prevent the engine from starting, making both the self-start and kick-start ineffective.
Engine Seizure: In rare cases, an engine seizure can cause both the self-start and kick-start to fail. This usually happens due to severe internal damage, such as a seized piston or a broken connecting rod.
To determine the exact cause of the problem, it is recommended to consult a qualified mechanic or take your motorcycle to an authorized service center. They will be able to diagnose the issue accurately and provide the necessary repairs or replacements to restore your bike's starting mechanism.