What kind of fuel should motorcycles use?
2 Answers
Motorcycles generally use 92 or 95 octane gasoline, depending on the motorcycle's manual and the engine's compression ratio. If the engine has a high compression ratio, it is recommended to use 95 octane gasoline; if the engine has a low compression ratio, 92 octane gasoline is suggested. The manufacturer specifies the appropriate fuel grade for the motorcycle, so a higher fuel grade does not necessarily mean better engine performance. The specific fuel grade for a motorcycle should be chosen according to the manual. If a motorcycle occasionally uses the wrong fuel grade, simply switch back to the correct grade after the current tank is used up. However, prolonged use of the wrong fuel grade can have the following effects: For vehicles designed for low-grade fuel, using a higher grade will not cause damage, but the increased octane rating can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for high-grade fuel, using a lower grade can cause engine knocking. If the octane rating is too low, the fuel's ignition point decreases, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance builds up during the upward stroke. This resistance makes the engine run very unevenly. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues. The vibrations not only affect driving stability but also cause abnormal wear on the pistons and cylinders, potentially leading to cylinder scoring in severe cases.
Having ridden motorcycles for over a decade, I can tell you that motorcycles primarily use gasoline, but the specific type depends on engine design. Most modern motorcycles run on unleaded gasoline, with octane ratings like 92, 95, and 98 indicating anti-knock performance—choose based on your manual or the recommended label on the fuel cap. For example, street bikes typically require 95 or higher, while classic bikes may suit 92. Never mistakenly use diesel or leaded fuel, as it can damage the engine. Additionally, engine oil is crucial and should be changed every 3,000-5,000 km, with synthetic or mineral oil depending on your riding frequency. High temperatures increase knocking risk, while cold starts suffer in winter, so seasonally appropriate fuel improves efficiency and engine protection. Always check your model’s requirements, avoid cheap/low-quality fuel, and prioritize reputable gas stations for safe riding.
