Need to know how motorcycle fuel injection works? Fuel injection engines for motorcycles function similar to those in cars, trucks and other modern engines. For many years, the carburetor was responsible for delivering fuel to the engine, and it wasn’t until the early 2000’s when motorcycle manufacturers began making electronic fuel injections systems standard. While some enthusiasts claim that this switch has taken away some of the ‘charm’ from their riding experience, the environmental benefits and more accurate fuel metering has made the electronic fuel injection engine an integral part in many of the current model lineups.
Fuel injection engines are controlled electronically by the Engine Control Unit (ECU), a small computer within the engine that measures many variables (such as throttle, RPM’s, air and engine temperature, and crankshaft position) in order to determine how much fuel should enter the engine through the fuel injectors. This allows the fuel metering process to operate more efficiently, thus creating less emissions and wasted energy, and creates a more responsive acceleration for the rider.
Essentially, a fuel injector is a valve that opens and closes via an electromagnet plunger whenever the ECU determines an adjustment is needed. For instance, when the throttle is held back the ECU will measure this and adjust the amount of fuel that enters the engine. The longer you hold back the throttle the more fuel is allowed to enter. All modern motorcycle fuel injectors are capable of opening and closing many times per second, and some higher end models can be adjusted to the millisecond, creating an even more accurate fuel consumption rate and acceleration.
Fuel is delivered to the injector via the fuel pump, which pressurizes the fuel as it leaves the gas tank and funnels it to the base of the injector. Once the ECU has determined to open the injector fuel is then forced through the valve, atomized in a mist (allowing it to burn more easily) and them sprayed into the engine’s intake valves. Once there it combines with air from the throttle valve to create the volatile mixture that will eventually ignite (via the spark plug) and power the engine’s crankshaft.
Motorcycle fuel injection engines are becoming more common each year, and with their precise fuel usage, more responsive acceleration, and ‘greener’ emissions it is not hard to imagine that in just a few more years all motorcycles will ditch the carburetor and make fuel injection engines standard.