The CBR900RR was introduced in 1992 and was fitted with an 893 cc (54.5 cu in) inline-four engine. When introduced, it set a precedent for light weight in the super bike class. At 453 lb (205 kg) with a full tank of gas, the CBR900RR was just 4 lb (2 kg) heavier than Honda’s own CBR600F2, and 76 lb (34 kg) lighter than the next-lightest open-class machine at the time, the Yamaha FZR1000. Minor changes to the 1994 model included an improved shift drum to cure notchy shifting, and steadier mirrors.
In a move to refine the CBR900RR’s handling traits on bumpy roads, the 1995 model’s suspension was upgraded with revised spring and damping rates, and a compression adjuster was added to the front fork. More aggressive bodywork incorporated a “cut reflector” design headlight and fewer of the CBR’s unique fairing holes. Slimmer and firmer footpegs were patterned after the RC45 and a shift linkage replaced the original model’s backward pedal. A new instrument panel included an electronic speedometer that measured speed from the countershaft sprocket. The only engine change in 1995 was the replacement of the aluminum valve cover with a magnesium piece.
1996 brought the first major changes to the CBR900RR. In order to achieve a more optimized balance of rigidity, Honda significantly altered the 1996 CBR’s chassis and suspension. The frame and swingarm were fabricated from larger, thinner-walled extrusions for reduced torsional rigidity. The fork and shock internals were re-designed, and the swingarm pivot raised by 5 mm (0.2 in). Revised ergonomics brought the bars 10 mm (0.4 in) higher and swept back five degrees more than earlier models, along with a slimmer gas tank. Engine updates included a bump in displacement to 919 cc (56.1 cu in) via a 1 mm (0.039 in) bore increase, slightly higher compression, a curved radiator, larger exhaust, extra clutch plates, smaller alternator, and the addition of a throttle position sensor. The 1996 model carried over to 1997 unchanged except for the updates to color/graphics offerings.
In 1998, Honda continued subtle refinements in the CBR919RR’s chassis. It saw frame stiffness closer to the original model’s, revised suspension internals, and 5 mm (0.2 in) less triple clamp offset (an almost universal aftermarket upgrade to previous models). New brake calipers acted on larger front discs, the fairing was re-shaped and raised footpegs subtly changed ergonomics again. Eighty percent of the engine’s internals were all-new to reduce weight and minimize friction; other updates included redesigned combustion chambers and porting, aluminum composite cylinders, new pistons, a smaller and lighter clutch pack, revised gearbox ratios, larger radiator, and a new stainless steel exhaust header.
The CBR929RR had a completely new 929 cc (56.7 cu in) engine incorporating fuel injection, more oversquare cylinder dimensions, larger valves set at a narrower included angle, lighter internals, and an all-titanium, HTEV-equipped exhaust system. The “pivotless” chassis had the swingarm mounted to the engine cases but incorporated a brace underneath the engine. Updated suspension and brakes included an inverted front fork and 330 mm (13 in) front discs; and the 16 in (410 mm) front wheel was replaced for a more common 17 in (430 mm) wheel.
In 2002, a brand new engine was made which increased capacity to 954 cc (58.2 cu in) which resulted in the CBR954 name. Larger injectors and radiator, re-mapped electronic fuel injection, and a more powerful computer were also added. The bodywork and fairings were reworked for a sleeker, more aerodynamic feel. The frame was strengthened and a more rigidswingarm added and the riding position/pegs were raised to allow for greater lean angles. Dry weight reduced to 168 kg (370 lb).
The CBR954RR was replaced by an all new CBR1000RR in 2004.
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Article Source: Wikipedia