Abbreviation for Electronic Fuel Injection. EFI is becoming more and more common on motorcycles as it has several advantages over carburetors. When correctly programmed, EFI provides the ideal air/fuel mixture under all conditions. This allows the engine to make the maximum power, reduces exhaust emissions (always a major concern of the manufacturers) and supply the [...]

Abbreviation for Electronic Control Module, sometimes called the Electronic Control Unit (ECU). The ECM is a small computer that determines the correct ignition timing and, on fuel injected motorcycles, the timing and duration of the injection of fuel into the engine. Other common names for this component are; brain box, black box, magic box, ignitor [...]