What are the symptoms of motorcycle heat fade?

1 Answers
Lois
07/29/25 12:14pm
Motorcycle heat fade symptoms include the throttle being fully open but the engine speed not exceeding 5000 RPM, speed not reaching 50 km/h, and the engine sound being muffled. Definition of heat fade: Heat fade occurs in air-cooled motorcycles during prolonged, high-speed riding over long distances in summer, when the engine cannot dissipate the high temperatures. Hazards of heat fade: Engine heat fade results in the vehicle losing acceleration power. When this happens, the cylinder expands, the piston rings lose elasticity, cylinder pressure drops, and power decreases; the engine oil becomes thin and loses its lubricating properties, increasing friction. In severe cases, the air-fuel mixture entering the cylinder is directly ignited by the high temperature, causing ignition timing to become erratic; the piston does not reach the top dead center of compression, reducing combustion efficiency.
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