What grade of gasoline should be used for the CB400X?
1 Answers
The manufacturer recommends using 97-octane gasoline. The CB400X has a compression ratio of 11.3:1. Engines with a compression ratio exceeding 10:1 should use 98-octane, while those below 10:1 are more suitable for 95-octane. It's not true that higher-octane gasoline is always better. Taking the 2022 Honda CB400X as an example: The vehicle dimensions are 2085×830×1370 (mm), with a seat height of 807mm, minimum ground clearance of 156mm, and a wheelbase of 1416mm. It is equipped with a 400ML twin-cylinder four-stroke engine, with a bore and stroke of 67.0x56.6mm, maximum power of 33.0kw/9000rpm, and maximum torque of 37.0nm/7500rpm. The official fuel consumption is 3.6L/100km. Wheel specifications: Front tire size is 120/70ZR17, rear tire size is 160/60ZR17, with a front dual-disc and rear disc braking system. The gasoline octane rating represents the fuel's octane number. Higher-octane fuel indicates a higher octane number, which means better anti-knock performance. This results in smoother engine operation, reduced wear, and better engine protection. Using lower-octane gasoline in a high-octane vehicle can cause engine knocking. Due to the significantly lower octane number, the gasoline's ignition point decreases, leading to premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is created during the upward stroke. This resistance makes the engine run very unstably. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues, affecting not only driving stability but also causing abnormal wear to pistons and cylinders, and in severe cases, cylinder scoring. Refueling precautions: When refueling: Turn off the engine, avoid using phones or making calls, and do not use open flames in the gas station. Always turn off the engine while refueling. If there is a queue, wait in line orderly without cutting in. When choosing fuel: Always select reputable gas stations with high-quality fuel and avoid those with poor-quality fuel. Long-term use of low-quality gasoline can lead to increased carbon deposits in the engine. It's essential to choose both a good gas station and the correct gasoline octane rating.
