In most motorcycles, including the Yamaha FZ series, a red line on the bike's meter typically indicates the engine's maximum recommended RPM (Revolutions Per Minute). The red line serves as a visual indicator to inform the rider not to exceed that RPM limit during operation.
Exceeding the red line and consistently running the engine at high RPMs for prolonged periods can put excessive stress on the engine components, potentially leading to increased wear, overheating, or even engine failure. It's crucial to stay within the recommended RPM range to ensure the longevity and optimal performance of the motorcycle.
The specific RPM at which the red line is set can vary depending on the specific model and engine configuration of the FZ bike. It is recommended to consult the owner's manual or contact the manufacturer for the precise RPM limit for your particular FZ model.