The Evolution of Fuel Injection


Ripping the top off your old flat-side carburetor to access the slide, or adjust the needle clip position, was always part of growing up with two-stroke motorcycles. As for making on-the-fly adjustments to four-stroke carburetors, it's generally a job left for a specialist mechanic.

What most of the motorcyclists (including myself) seem reluctant to accept at the moment is that those days will soon be over... and the era of electronic fuel injection (EFI) is about to begin.

Human nature will always dissect, analyze, question and resist anything new, and the subject of skepticism right now is the practicality of EFI on small and mid-range motorcycles. Ironically, it seems most are waiting for this technology to prove itself as a functional feature, when EFI has been efficiently fueling the automotive world for the past 30 years and most larger road bikes for the past 10 years.
With Electronic Fuel Injection now standard on most newly introduced small displacement motorcycles and scooters in Thailand, carburetor genocide is imminent. Embrace it, for this is just the beginning of the new breed of user-friendly and fuel-efficient riding experience.

What are some advantages and disadvantages of having a Electronic Fuel Injection motorcycle. The first advantage is the ease of starting in any climate, as EFI monitors the environment and adjust fuel delivery to suit. The second reason to go for a EFI motorcycle would be the more efficient combustion across entire rev range, giving better fuel economy. And the engine can withstand more torque loads at low rpm as induction is not dependent on intake vacuum to maintain delivery of fuel to cylinder, meaning the engine won't bog under higher load.

A few disadvantages we can think off are the fuel system is dependent on the function and reliability of an immersed fuel pump inside the fuel tank. The motorcycle becomes completely battery-dependent, death battery means death bike.
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