The Royal Enfield Bullet is designed to handle sustained speeds of 90-100 kmph (56-62 mph) for extended periods without any significant issues. Riding your Royal Enfield Bullet at these speeds for 3-4 hours should generally be well within its capabilities.
Ensure that you follow the manufacturer's recommended maintenance schedule, including oil changes, filter replacements, and other necessary servicing.
Cooling: Sustained high-speed riding can generate more heat in the engine. Ensure that the cooling system, including the radiator and coolant, is functioning correctly. Monitor the engine temperature gauge while riding and be cautious if it approaches the upper limit.
Oil Level and Quality: Check the engine oil level before embarking on a long ride and ensure it is within the recommended range. Also, use the appropriate grade and quality of engine oil recommended by the manufacturer.
Fuel Quality: Always use good quality fuel from reputable sources to ensure the optimal performance of your motorcycle. Poor-quality fuel can negatively affect engine performance and potentially lead to issues.
Breaks and Rest: Riding continuously for 3-4 hours can be physically demanding. Take regular breaks to rest, hydrate, and stretch to avoid fatigue and maintain focus.
By taking these factors into account and ensuring that your Royal Enfield Bullet is well-maintained, you should be able to ride comfortably at 90-100 kmph for several hours without causing an engine seizure. However, it's important to note that unexpected issues can still occur, so it's advisable to listen to your motorcycle and pay attention to any unusual sounds, vibrations, or warning signs. If you notice any abnormalities, it's best to have your motorcycle inspected by a qualified mechanic.