Loud sounds or noises during gear shifting can indicate potential issues with the clutch system or gearbox. While I don't have specific knowledge about the Yamaha FZS V2, clutch problems can occur in motorcycles due to various reasons, including:
Worn clutch plates: Over time, the clutch plates can wear out, causing slipping or engagement issues, which may result in loud noises during gear shifting.
Incorrect clutch adjustment: If the clutch cable or hydraulic system is not adjusted correctly, it can affect the clutch engagement and lead to noise when shifting gears.
Clutch basket issues: The clutch basket contains multiple components, including gears, plates, and springs. Problems with any of these components can cause noise during gear shifting.
Gearbox issues: Faulty or damaged gearbox components, such as gears, dogs, or synchros, can also produce unusual sounds during gear changes.
If you are experiencing loud dashing sounds while shifting gears on your Yamaha FZS V2, it would be best to have it inspected by a qualified mechanic or contact an authorized Yamaha service center. They will be able to diagnose the issue accurately and provide you with the necessary solutions or repairs.
Remember, it's always important to address any potential issues with your motorcycle's clutch or gearbox promptly to prevent further damage or safety risks.