Other interesting info there too:Honda knew that merely continuing to offer what was arguably the best all around 600 on the planet might not be enough to continue generating strong sales numbers, so the decision was made to focus on boosting the F4's performance while basically leaving the comfort of the bike alone.
The 370 pound (dry) F4i is not a totally new bike, rather a heavily modified F4 with numerous engine, chassis and bodywork changes. The single largest change, other than styling, is the addition of high-pressure (50psi) programmed fuel injection - thus the model designation "F4i". Fuel injection allows for more precise fuel metering and delivery over a wider rpm range, while providing better throttle response and decreasing the ever important emission levels.
Additional engine changes include a lighter cam shaft sprocket and increased valve spring pressure (two springs per intake valve) which allow for higher revving. There are new piston rings that slide with less friction and increased internal engine oil flow. Honda claims the revamped engine puts out 5% more peak horsepower; redline is now 14,200 rpm, 700 rpm higher than last years F4.
The F4i isn't designed just to rev higher, as the engineers at Honda wanted increased top end power out of the liquid-cooled DOHC 16-valve engine without sacrificing low-end and mid-range torque. Ringing more power out of an engine means you must bring in more air. More airflow means greater intake noise, something that's hard to deal with considering the current noise regulations. The answer for Honda came by way of a two-stage ram-air system utilizing resonator chambers fitted to the plastic air intake ducts.
To increase the bikes pulling capabilities at high speeds, 5th and 6th gears have been shortened slightly and the rear sprocket was enlarged from 45 teeth to 46.
The California model possesses slightly different ignition mapping and utilizes a catalyzer in the exhaust system to help the bike meet 2004 emissions standards. Two horsepower are sacrificed in the process.
The aluminum twin-spar frame was made more rigid to improve the F4s handling as well as to increase feedback to the rider. Other rolling chassis changes focused on reducing unsprung weight and increasing the rigidity of individual components. Over a pound was taken off the front wheel assembly, with about 300 grams taken off the 3.5 x 17 inch wheel itself. The wheel bearings were moved outward, closer to the fork tubes and the rotor carriers were moved out closer to the brake calipers - all to reduce weight and to improve rigidity of the pieces. Weight was also taken off the 5.5 x 17 rear wheel assembly, nearly 2 1/2 pounds. The rear cush drive was also redesigned for less lash and a more direct feel.
The F4i's new bodywork carries a more racy look and slips through the air with a 3% reduction in COD. It also houses a new dual headlight design which uses 40% brighter H7 bulbs. The turn stalks are shorter and the mirrors are now positioned higher and closer to the rider so you don't feel like you're looking across an ocean to view them. Storage has been added under the rear seat, though the seat doesn't cleverly flip up like on the 929RR.
The elimination of carburetors allowed for a slightly larger air box and a larger fuel tank (4.8 us gallons / incl. 0.9 reserve) complete with a delayed fuel level sensor to fight against false readings when the bike is leaned over. One silly new feature is an amber shift indicator. We know where our eyes should be when riding, do you?
Who would you like developing your next sportbike?
Mr. Hiroyuki Ito, the F4i Large Project Leader, has 25 years of experience working on a wide variety of Honda motorcycle projects. Mr. Ito was also a top racer in Japan, finishing as high as second overall at the 1982 Suzuka Eight-Hour on a Honda race bike of his own design, dubbed the RS1000.
u have to connect two connections together. its should be a large size connection and clip - i didn't this to my streetfighter F2. thats all u need to do just connect that and u're ready to go no bypass or anything.boostnsrt said:since you guys seem to know alot about the f series maybe you can help. i'm building a 96 f3 street fighter, the only problem is the bike will not run out of 1st gear withou the guage cluster plugged in. i've tried everything. i've looked over the wiring scematic and can't figure it out. there are 2 main plugs that run every thing. according to the diagram the only thing pluged into the cdi is the tach. but if i leave the tach plugged in and unplug everything else it still does the same thing. i bought a daytona digital tach to use and a speedo and would like to use them