Using a premium fuel with a higher octane rating than specified by the motorcycle manufacturer is unlikely to improve engine power or fuel economy in most cases. The octane rating of a fuel refers to its resistance to knocking or pre-ignition.
Motorcycle engines are typically designed to operate optimally with a specific octane rating, which is usually mentioned in the owner's manual. Using a fuel with a higher octane rating than recommended does not provide any additional benefit unless the engine is specifically designed to take advantage of higher octane fuels.
In modern motorcycles, the engine management systems are usually equipped with knock sensors and are designed to adjust the ignition timing and fuel delivery based on the detected fuel octane rating. If the engine management system detects a higher octane fuel than required, it will not advance the ignition timing or make any adjustments to extract more power or improve fuel economy.
Using a higher octane fuel may only be beneficial in certain situations, such as if the engine has been modified or tuned to take advantage of higher octane fuels, or if the motorcycle experiences knocking or pinging with the recommended fuel. However, in most cases, using the fuel with the octane rating recommended by the manufacturer is sufficient for normal operation and performance.