The Honda CBR600F4i was a sport bike produced by Honda

Honda

is a Japanese public multinational corporation primarily known as a manufacturer of automobiles and motorcycles.Honda has been the world's largest motorcycle manufacturer since 1959, as well as the world's largest manufacturer of internal combustion engines measured by volume, producing more than...

 from 2001 to 2006.
For the 2001 model year Honda released an upgraded version of the popular CBR600F4

Honda CBR600F4

The Honda CBR600F4 was a sport bike produced by Honda between 1999 and 2000. It was the last of the CBR600 series of Honda sportbikes to be carbureted....

 with intentions of becoming more competitive in the middleweight sport bike class. The 370 lb (167.8 kg) (dry

Motorcycle testing and measurement

Motorcycle testing and measurement includes a range of more than two dozen statistics giving the specifications of the motorcycle, and the actual performance, expressed by such things as the output of the engine, and the top speed or acceleration of the motorcycle. Most parameters are...

) F4i is a modified F4 with numerous engine, chassis and bodywork changes.

The single largest change aside from the styling is the addition of high-pressure (50 psi) programmed fuel injection — thus the model designation "F4i".