Yamaha's YZF-R1 has always been a great looking machine. In fact it was our most downloaded wallpaper for 2002.
For 2004 the R1 looks even more striking, and Yamaha has thoroughly revised their sporting flagship for the new model year.
Changes include;
New bore and stroke, now 77 x 53.6mm (Previously was 74 x 58mm)
A new closed-deck cylinder block allows the larger bore engine to grow only 2.8mm wider (Rather than the full 12mm difference in bore size)
Larger bores allow for larger valves
Yamaha are claiming an amazing 180hp with ram-air assistance @ 12,500rpm
A shorter cylinder head now angled further forward
Intake camshafts now have more lift and duration
12.1:1 compression ratio (Up from 11.8:1)
Electronic fuel injection system now features secondary throttle valves
The new cylinder head allows the frame spars to go over the engine instead of around
The crankshaft is 16% lighter
The shorter con-rods for the shorter stroke engine are 9% lighter
Close ratio 6-speed gearbox
A new underslung die-cast truss swingarm (Claimed to be 30% stiffer)
The 43mm Kayaba forks have stiffer springs, fork offset increased by 5mm
Trail is reduced from 103mm to 97mm
New titanium exhaust system exits under the seat (stainless mid-pipe)
Radial mount calipers clamp on 320mm disc rotors
Brembo radial pump master cylinder
Narrower two-piece fuel tank. Fuel is kept in rear while front half contains new ram-air system
All new aluminium Deltabox main frame (Yamaha are claiming 200% more rigidity vertically, 50% stiffer laterally and 30% stiffer torsionally)
Frame width is reduced from 464 to 395mm
Clip ons are 10mm higher, pegs are 2.5mm further forward and 7.5mm lower
Headlights similar to that recently seen on the R6
New instruments with adjustable shift light
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Specifications - Yamaha YZF-R1 (2004)
Engine - 998cc, liquid-cooled, in-line four
Valvetrain - DOHC, 5-valves per cylinder
Compression Ratio - 12.1:1
Induction - Electronic fuel injection, dual throttle butterflies
Gearbox - 6-speed
Front Suspension - Kayaba 43mm upside-down forks, fully adjustable
Rear Suspension - Single shock with piggyback reservoir, fully adjustable
Front Brakes - 320mm discs with radially mounted 4-piston calipers
Rear Brake - 220mm disc
Tyres - 120/70-ZR17 (F), 190-50ZR17 (R)
Length - 2,065mm
Width - 719mm
Height - 1,105mm
Seat Height - 833mm
Wheelbase - 1,395mm
Rake - 24.0°
Dry Weight - 172kg
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