Riding a motorcycle on low fuel is not inherently bad for the engine, but it can have some potential negative effects and is generally not recommended. Here are a few reasons why riding on low fuel can be problematic:
Fuel pump damage: Many motorcycles have fuel pumps located inside the fuel tank. These pumps rely on the fuel to keep them cool and lubricated. When the fuel level is low, the pump may not receive adequate lubrication and cooling, which can lead to premature wear or failure.
Fuel filter clogging: The fuel filter's purpose is to remove impurities from the fuel before it reaches the engine. When the fuel level is low, the remaining fuel in the tank may contain more sediment and contaminants, increasing the likelihood of clogging the fuel filter.
Fuel system damage: Running on low fuel can lead to the intake of air or vapor into the fuel system, particularly if the motorcycle is equipped with a fuel pump that relies on fuel for cooling and lubrication. Air or vapor in the fuel system can cause poor engine performance, misfires, and potentially damage components like fuel injectors or carburetors.
Running out of fuel: If you continue riding on low fuel without refueling, you risk running out of fuel completely. This can leave you stranded on the road, which is inconvenient and potentially dangerous depending on your location.
To avoid these potential issues, it's generally recommended to maintain a sufficient fuel level in your motorcycle's tank. Refuel before the fuel level drops too low, and make it a habit to monitor your fuel gauge or use the trip meter to track your mileage and estimate your remaining fuel.