Most motorcycles are air-cooled rather than liquid-cooled, which means they do not have a radiator. Air-cooled motorcycles rely on the circulation of air around the engine to dissipate heat and keep the engine cool.
Liquid-cooled motorcycles use a cooling system that circulates coolant (usually a mixture of water and antifreeze) through the engine and a radiator. The radiator helps dissipate heat from the coolant by transferring it to the surrounding air.
If a liquid-cooled motorcycle were to run without a radiator or with a malfunctioning radiator, it would likely overheat quickly. Operating the engine without proper cooling can lead to severe engine damage, such as warped cylinder heads, blown head gaskets, or even a seized engine.
It's important to note that air-cooled motorcycles and liquid-cooled motorcycles are designed differently, and their cooling systems are specific to their respective designs. Attempting to run a liquid-cooled motorcycle without a functioning radiator is not recommended and can have serious consequences. If you are experiencing cooling system issues with your motorcycle, it is best to have it inspected and repaired by a qualified mechanic.