Yamaha XJ 750E-II (1983) vs Yamaha XT 660X (2014)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XJ 750E-II | XT 660X |
| Years: | 1983 | 2014 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder | Four stroke, single cylinder, SOHC, 4 valve |
| Capacity: | 749 cc / 45.6 cu-in | 659 cc/ 40.2 cu-in |
| Bore x Stroke: | 65 х 56.5 mm | 100 x 84 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Lubrication: | Wet sump | Dry sump |
| Compression Ratio: | 9.8:1 | 10: 1 |
| Induction: | HSC33 carburetors | Fuel injection, 44 mm throttle body |
| Ignition: | Transistorized | TCI |
| Starting: | Electric | Electric |
| Max Power: | 87 hp / 64.8 kW @ 9000 rpm | 33.8 kW / 48 hp @ 6000 rpm |
| Max Torque: | 7.1 kgf-m / 51.3 lb-ft @ 7000 rpm | 58.4 Nm / 5.7 kgf-m @ 5250 rpm |
| Clutch: | Wet multiplate | Wet, multiple-disc coil spring |
| Transmission: | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Chain |
| Frame: | Double cradle | Steel tubular diamond frame with dual tank rails |
| Front Suspension: | 36mm Showa forks adjustable air pressure anti-dive resistance | 43 mm Telescopic forks, |
| Front Wheel Travel: | 150 mm / 5.9 in | 225 mm / 8.8 in |
| Rear Suspension: | Dual dampers adjustable for spring preload rebound damping | Oscillating arm standard Monocross. |
| Rear Wheel Travel: | 97.5 mm / 3.8 in | 200 mm / 7.9 in |
| Front Brakes: | 2x 300mm disc 2 piston calipers | Single 320mm disc 4 piston caliper |
| Rear Brakes: | Single disc | Single 245mm disc 1 piston caliper |
| Front Tyre: | 100/90-18 | 120/700-17 |
| Rear Tyre: | 120/90-18 | 160/60-17 |
| Rake: | 27° | 26.0° |
| Trail: | 114 mm / 4.4 in | 94 mm / 3.7 in |
| Wheelbase: | 1480 mm / 58.2 in | 1505 mm / 59.3 in |
| Seat Height: | 785 mm / 31 in | 875mm / 34.4 in |
| Dry Weight: | 214 kg / 471.4 lbs | 173 kg / 318.4 lbs |
| Wet Weight: | 241 kg / 531.3 lbs | 186 kg / 410.1 lbs |
| Fuel Capacity: | 22 Litres / 5.8 US gal | 15 Litres / 3.9 gal |