Why does the engine of a new motorcycle get hot?

[StLukas]

Reasons for motorcycle engine overheating: fuel combustion and friction from the piston rings in the cylinder. Fuel combustion: Fuel combustion is easy to understand. When the motorcycle engine is running, the cylinder moves up and down to provide output power. In a four-stroke motorcycle engine, two up-and-down movements of the cylinder constitute one working cycle. The first movement occurs when the spark plug ignites the fuel sprayed by the injector while the cylinder is near the intake valve position, thereby pushing the cylinder downward to generate power. During combustion, excess heat is released, which is then dissipated through the engine's outer casing. Friction from the piston rings in the cylinder: Another source of heat is the intense reciprocating motion of the motorcycle's cylinder and cylinder walls during operation. Although engine oil provides lubrication, heat generation during movement is unavoidable.