Electronic Fuel Injection is a fuel delivery system operated
and controlled by an artificial intelligence module programmed to
deliver the correct amount of fuel to the engine under all conditions
using collected input from the various systems of the motorcycle. An
EFI uses these inputs to calculate the right amount of fuel mixture for
optimum performance and change the fuel mixture to meet these demands.

Electronic Fuel Injection (EFI) was originally used on Harley
Davidson motorcycles beginning in the 1995 production year and
currently the Delphi Electronic Fuel Injection system is used on all
Harley Davidson models. This Electronic Sequential Port Fuel Injection
system was introduced in Harley Davidson Softail motorcycles in 2001,
touring motorcycles in 2002, Dyna motorcycles beginning in 2004, and
V-Rod motorcycles in 2002, before becoming standard equipment for all
models in 2007.

Originally introduced by Harley Davidson as a viable way to meet
expected emission standards around the continental United States and
improve the reliability of the engine in varying environmental
conditions. Electronic Fuel Injection allows for better starting in
both hot and cold environments, makes the acceleration more consistent
under these varying environmental conditions, and the power and
performance of the bike smoother at higher altitudes. It does this by
feeding the right amount of fuel for optimum operating of the
motorcycle under changing conditions. This in turn has the benefit of
producing less emissions overall.

Electronic Fuel Injection is more complex in design and
implementation than carburetion and there’s an increase in cost over
the long run for the rider due to the need for expensive parts and
tuning. If you want to modify your motorcycle–an EFI system makes it
much more complicated, because changes to any component of the
motorcycle’s engine requires changes to the fuel map of the EFI system.
Generally, factory motorcycles have been tuned to a high degree of
reliability, and adjusting them can be an expensive procedure.
Correctly done, changes to the engine can certainly provide an increase
in power and performance, but changes also nullify the engine warranty.

There are chip upgrades and piggy back computers available for
helping owners make upgrades. Also, there are software management
applications for making racing engine adjustments, but these programs
are only recommended for professionals.