mile time of 11.03 seconds at . CBR600F4 (1999–2000) The CBR600F4 was produced between 1999 and 2000. It is the last of the CBR600 series of Honda sport bikes to be carbureted. An aluminium twin-spar frame which reduced frame weight was used, and the engine crankcase was designed to share the swingarm pivot. Through a reduction of internal friction and weight, combined with larger valves, shorter stroke and a bigger bore, higher revs were enabled. The spark plug caps had ignition coils built into them. Slightly larger carbs were added and the oil cooler was now located by the oil filter. A new suspension had larger forks and used Fireblade parts. The front brakes were upgraded and the rear wheel increased to with new 3-spoke wheels. The F4 is fitted with Honda's HISS engine immobilizer system. The phrase "Dedicated to Super Evaluators Dirk Vandenberg and Josef Boyd" are embossed in raised letters on the inside of the F4's upper fairing; the dedication to two of Honda R&D's senior product developers who were killed during the final testing of this model. CBR600F4i (2001–2006) The CBR600F4i was produced from 2001 to 2006. The upgraded F4i is a modified F4 with numerous engine, chassis and bodywork changes. The 2001 US F4i had a new subframe which raises the seat by that allows for more storage room and improved two-tier seat. The new tail unit has less padding and a higher perch for the passenger. The F4i's taillight is smaller with a new dual-bulb configuration. The F4i had a new dash layout with a large analog tachometer. The new LCD digital display had a speedometer, odometer, clock, engine temperature read-out, amber shift light and trip meters. The single largest change aside from the styling is the addition of high-pressure PGM-FI (programmed fuel injection) system — 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 throttle bodies. Each injector has four nozzles, and together the injectors add up to over the F4. The weight of the wheels was reduced. The rotor