| MODEL | YAMAHA XT 660R 2004 |
| Year | 2004 |
| Engine Type | Four-stroke, single cylinder, SOHC, 4 valves |
| Displacement / Capacity | 659 cc / 40.2 cu in |
| Bore X Stroke | 100 x 84 mm |
| Compression Ratio | 10.0:1 |
| Cooling System | Liquid cooled |
| Max Power | 33.8 kW / 48 hp @ 6000 rpm |
| Max Torque | 58.4 Nm / 5.7 kgf-m @ 5250 rpm |
| Ignition | TCI |
| Induction | Electronic fuel injection, 44 mm throttle body |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 5 speed |
| Clutch | Wet, multi-plate, coil spring |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Steel tubular diamond frame with dual tank rails, engine as stressed member |
| Front Suspension | 43 mm telescopic forks, 225 mm / 8.8 in travel |
| Rear Suspension | Monocross swingarm with progressive link, 200 mm / 7.9 in travel |
| Front Brakes | Single 298 mm disc, 2-piston caliper |
| Rear Brakes | Single 245 mm disc, 1-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2240 mm / 88.1 in |
| Overall Width | 845 mm / 33.2 in |
| Overall Height | 1230 mm / 48.4 in |
| Seat Height | 865 mm / 34.1 in |
| Wheelbase | 1505 mm / 59.3 in |
| Ground Clearance | 210 mm / 8.3 in |
| Dry Weight | 172 kg / 379.2 lb |
| Wet Weight | 181 kg / 421 lb |
| WHEEL SPECS | |
| Front Tyre | 90/90-21 |
| Rear Tyre | 130/80-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 3.3 US gal |
| Fuel Consumption | 23 km/l |
| Top Speed | 164.7 km/h / 102.3 mph |
Photo: Addvisor, CC BY-SA 4.0, via Wikimedia Commons
Photo: Frukko, CC BY-SA 3.0, via Wikimedia Commons
Yamaha's first major rebuild of the XT line in over a decade, with a new four-valve liquid-cooled top end and fuel injection with twin catalytic converters. It sits on an open-cradle diamond frame that uses the engine as a stressed member. More road-oriented than earlier XTs but still the more off-road-capable choice among its rivals.
