The Yamaha YZF-R1 2004 Model Specs

With the competition advancing, Yamaha took to a major development. This included style updates like an underseat exhaust, and performance upgrades including radial brakes and for the first time on an R1 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 (no longer used as a stressed member of the chassis) featured a separate top crankcase and cylinder block. The 2004 R1 produces a stated 172 hp at the crankshaft (excluding RamAir,180 with the ram air) and also weighs 172 kilograms. Also newly added for this year was a factory installed steering damper. Combined with the changes to the frame, it helped to eliminate the tendency of the handlebars to shake violently during rapid acceleration or more so during deceleration on downgrade and less-than-perfect surfaces (aka "tank slapping").

Engine
Type:	Liquid-cooled, 4-stroke, forward inclined, parallel cylinder, DOHC 20 valves
Displacement:	998cc
Bore x Stroke:	77.0 x 53.6 mm
Compression ratio:	12.4:1
Maximum power:	132 kW (180 HP) @ 12,500 rpm with direct air induction126.4 kW (172 HP) @ 12,500 rpm without direct air induction
Maximum torque:	106.6 Nm (10.9kg-m) @ 10,500 rpm without direct air induction 110.1 Nm (10.9kg-m) @ 10,500 rpm with direct air induction
Chassis
Front tyre:	120/70 ZR17M/C
Front brakes:	Dual floating discs, � 320mm
Front suspension:	Telescopic fork, � 43mm
Front travel:	120mm
Rear Tyre:	190/50 ZR17M/C
Rear suspension:	Swingarm (Link suspension)
Rear travel:	130mm
Rear brakes:	Single disc, � 220mm
Dimensions
Overall length:	2,065 mm
Overall width:	720 mm
Overall height:	1,105 mm
Seat height:	835 mm
Wheelbase:	1,395 mm
Minimum ground clearance:	135 mm
Dry weight:	172 kg