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For the 2001 model year Honda released an upgraded version of the popular CBR600F4 with intentions of becoming more competitive in the middleweight sport bike class. The 370 lb (170 kg) (dry) 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". In a number of countries, the bike was sold in both the "normal" and "Sport" variants, the Sport having a two-part seat, no grab rail and no main stand (though the main stand mounting holes remained). Fuel injection allows for more precise fuel metering and delivery over a wider rpm range, while providing better throttle response and reducing emissions. The injectors reside one per cylinder and work with 38 mm throttle bodies. Each injector has four nozzles, and together the injectors add up to five horsepower over the F4. 2001 2002 2003 01 02 03 CBR-600F4i CBR600-F4i