What are the reasons for a motorcycle engine heating up quickly?

[DeLouis]

Here are the reasons why a motorcycle engine heats up quickly: 1. Oil issues: Insufficient oil quantity in the engine or deteriorated oil, such as emulsified oil, oil diluted by gasoline, thickened oil, etc., leading to poor lubrication of engine components; the quality grade of the engine oil selected is too low or the viscosity is too high. 2. Gasoline issues: The gasoline used is substandard with poor anti-knock performance. 3. Improper operation: A newly overhauled engine operates at high speed and high power during the break-in period; prolonged, long-distance, high-load, and high-speed driving can easily cause excessive temperature. 4. Engine issues: The engine ignition timing is advanced; the air-fuel mixture is too lean or too rich. 5. Spark plug issues: The spark plug does not ignite continuously, or there is excessive carbon buildup on the spark plug. 6. Clutch issues: Clutch slippage causes the engine to slip.