A new system of fuel injection was introduced for the year 2002,,which works like a carburetor by employing a cv carburetor slide,controlled by a vacuum created by the engine ,with a smilar output of power of 2000-2001 bike,,the new change in bike was a improvement of cylinder sleeves of the high silicon,content alloy containing magnesium that minimized heat induced distortion,reducing consumption of oil,in 2002 also,yamaha has released a newly developed"DELTABOX III" frame,with its hydro formed construction,dramatically reduced the total number of frame welds, the cooling system was also redesigned for a good performance ,the exhaust system was changed from 4-into-1 to a new titanium 4 into 2 in 1 design ,and minor body changes have done ,,,
CHANGES:
1) Fuel injection
2) Cylinder sleeves
3) Delta-box III frame
4) Exhaust system
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Source: Yamaha R1 (2004-2005)
Yamaha R1 (2004-2005
With the advanced competition,,the Yamaha took to a major development,this include style updated like an under seat twin exhaust,and performance also upgrades including redial brakes and the first time on an R-1, RAM-AIR INTAKE.,furthermore ,the wheelie tendency known from earlier productions is drastically reduced by changing frame geometry and weight properties,,,the all new engine ,featured a separate top crankcase and cylinder block..The R1 of 2004 produces 132-134,hp at rear wheel,and also weighs 172 kilograms (dry),,and front brake calipers also replaced by radially-mounted calipers ,activated by a radial master cylinder.
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CHANGES:
1) Under seat twin exhaust
2) Weight properties
3) Separate top crankcase and cylinder block
4) 132-134 hp at rear wheel
5) Front brake calipers into radially mounted calipers,activated by a radial master cylinder
