| MODEL | YAMAHA XT 660X 2007 |
| Year | 2007 |
| Engine Type | Four stroke, single cylinder, SOHC, 4 valve |
| 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 | Fuel injection, 44 mm throttle body |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 5 Speed |
| Clutch | Wet, multiple-disc coil spring |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Steel tubular diamond frame with dual tank rails |
| Front Suspension | 43 mm telescopic forks, 225 mm / 8.8 in travel |
| Rear Suspension | Oscillating arm, Monocross, 200 mm / 7.9 in travel |
| Front Brakes | Single 320 mm disc, 4 piston caliper |
| Rear Brakes | Single 245 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2175 mm / 85.6 in |
| Overall Width | 860 mm / 33.9 in |
| Overall Height | 1170 mm / 46.1 in |
| Seat Height | 875 mm / 34.4 in |
| Wheelbase | 1505 mm / 59.3 in |
| Ground Clearance | 210 mm / 8.3 in |
| Dry Weight | 173 kg / 381 lb |
| Wet Weight | 186 kg / 410.1 lb |
| WHEEL SPECS | |
| Front Tyre | 120/70-17 |
| Rear Tyre | 160/60-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 4.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
Street-going supermoto version of the XT660 single, with 17-inch wheels, a 320 mm front disc with a four-piston Brembo caliper and a stiffer frame and swingarm than its predecessor. Built for city riding and twisty roads, it shares the 660 cc fuel-injected single with the XT660R. Yamaha did not plan to import it to the US.
