The best octane rating for motorcycles depends on the specific requirements of the engine. Most motorcycles are designed to run efficiently on regular unleaded gasoline, which typically has an octane rating of 87 or 91 in the United States.
Higher octane fuel, such as premium gasoline with octane ratings of 91 or 93, is formulated to resist knocking or pre-ignition in high-performance engines with higher compression ratios. However, if your motorcycle's engine is not designed to take advantage of higher-octane fuels, using them will not provide any significant benefits and may even result in reduced performance or increased fuel consumption.
To determine the appropriate octane rating for your motorcycle, it's best to consult the owner's manual or contact the manufacturer. They can provide specific recommendations based on the engine design and any modifications that have been made to the motorcycle. Following their guidelines will help ensure optimal performance and longevity for your motorcycle's engine.