What are the reasons for a new motorcycle engine getting hot?

[RubyFitz]

Reasons for a motorcycle engine getting hot: fuel combustion and friction from the cylinder piston rings. Fuel combustion: Fuel combustion is easy to understand. During the operation of a motorcycle engine, 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. The combustion process releases excess heat, which is then dissipated through the engine's heat-conducting outer casing. Friction from the cylinder piston rings: Another source of heat is the intense reciprocating motion of the motorcycle's cylinder block and cylinder walls during operation. Although engine oil provides lubrication, some heat generation is inevitable during this movement.