What grade of gasoline is best for the Yamaha Xianying 125?

[StReagan]

The Yamaha Xianying's engine has a compression ratio of 9.5, making 93-octane gasoline the most suitable choice. It is not recommended to use gasoline with a higher octane rating as it may lead to insufficient power. Below is extended information regarding 95-octane and 92-octane gasoline: 95-octane gasoline: 95-octane gasoline consists of 95% isooctane and 5% n-heptane. High-octane gasoline should be used when the engine has a high compression ratio. Using low-octane gasoline in a high-compression engine can cause abnormal combustion, resulting in knocking, increased fuel consumption, and reduced driving power. 92-octane gasoline: 92-octane gasoline has an octane rating of 92 and contains 8% n-heptane, making it suitable for mid-range vehicles with relatively low compression ratios. Reason: It is advisable to follow the manufacturer's recommendations and avoid long-term use of high-octane gasoline. High-octane gasoline can alter ignition timing, and prolonged use may not only be detrimental to the vehicle but also shorten the engine's lifespan. While high-octane gasoline can be used in emergencies, low-octane gasoline should never be used.