What does EFI mean for motorcycles?

[TessaFitz]

EFI for motorcycles refers to motorcycles equipped with electronic fuel injection engines. Here are the detailed explanations: The differences between EFI and carburetor engines: There are also significant differences in operation methods. When starting an EFI engine (including cold starts), there is no need to press the throttle. This is because EFI engines are equipped with cold start enrichment and automatic cold fast idle functions, ensuring smooth starts whether the engine is cold or hot. Precautions: Before and during starting the engine, repeatedly pressing the throttle pedal quickly to increase fuel injection, as done with carburetor engines, is ineffective. This is because the throttle pedal in an EFI engine only controls the opening of the throttle valve, and the fuel injection amount is entirely determined by the computer based on intake parameters; In a low-fuel state, the EFI engine should not run for an extended period. This is because the electric fuel pump is cooled by the fuel flowing through it.

[DiKira]

Last time I was fixing my neighbor's motorcycle, we talked about this. EFI (Electronic Fuel Injection) is essentially a system that uses a computer to control fuel injection, unlike the old carburetors that relied on mechanical principles for fuel delivery. The working principle is quite clever: various sensors are installed on the engine to constantly monitor parameters like RPM and temperature, sending this data to the onboard computer (the ECU). The computer instantly calculates the optimal fuel injection amount and timing, directing the injectors to atomize and spray fuel into the cylinders. The benefits are numerous: cold starts are instant, acceleration is smooth without hesitation, fuel consumption can be reduced by 10-15%, and most importantly, emissions are cleaner, meeting today's strict environmental standards. However, this system is highly precise and requires diagnostic tools for maintenance, making it difficult for ordinary repair shops without the proper equipment to handle.

[RicardoLee]

Over the past few years, I've ridden five or six different brands of EFI motorcycles. The most noticeable difference is how effortless starting is – just press the ignition button and it fires up instantly even in sub-zero temperatures, no need to fiddle with choke levers like carbureted bikes. The throttle response during acceleration is incredibly sharp, delivering immediate power without any lag, which makes overtaking much more confident. I've also observed significantly improved fuel efficiency – a 125cc bike can easily cover 400km on a full tank. However, regular maintenance is crucial. Once I tried saving money by refueling at a sketchy gas station, which led to clogged fuel injectors costing me 300 yuan to clean. Now I only use reputable stations, and the system has proven very reliable with just one throttle body cleaning every 10,000 kilometers.

[DeLena]

In the early years, motorcycles mostly used carburetors, which relied on physical adjustments to control the air-fuel mixture ratio. The precision was poor, and performance was easily affected by temperature. By the late 1990s, electronic fuel injection (EFI) technology began to gain popularity, marking a significant upgrade in motorcycle fuel systems. EFI-equipped motorcycles replaced mechanical adjustments with electronic sensors, allowing the onboard computer to adjust fuel injection parameters in real-time based on engine conditions. This technological advancement addressed three major pain points of carburetors: power loss in high-altitude areas, difficulty starting in cold weather, and excessive exhaust emissions. Nowadays, even small-displacement scooters are widely equipped with EFI systems. Take the newly released China IV standard motorcycles, for example—without EFI, they can’t even be registered.