Yamaha XS 650 (XS-1F) (1971) vs Yamaha TDM 900A (2004-05) vs Ducati 998 S Bayliss Replica (2002) vs Yamaha WR450F (2017-18)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Ducati | Yamaha |
| Model: | XS 650 (XS-1F) | TDM 900A | 998 S Bayliss Replica | WR450F |
| Years: | 1971 | 2004-05 | 2002 | 2017-18 |
| Engine: | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. | Four stroke, parallel twin cylinder, DOHC, 5 valves per cylinder | Four stroke, 90° “L” twin cylinder, DOHC, desmodromic 4 valve per cylinder, belt driven | Four stroke, Single cylinder, DOHC, 4 titanium valves |
| Capacity: | 653 cc / 39.8 cu in | 897 cc / 54.7 cu-in | 998 cc / 60.9 cu in | 449 cc / 27.4 cu in |
| Bore x Stroke: | 75 x 74 mm | 92 x 67.5 mm | 100 x 63.5 mm | 97.0 x 60.8mm |
| Compression Ratio: | 8.4:1 | 10.4:1 | 11.4:1 | 12.5:1 |
| Cooling System: | Air cooled | Liquid cooled | Liquid cooled | Liquid cooled |
| Lubrication: | Wet sump | Dry sump | Wet sump | Dry sump |
| Induction: | 2 x Mikuni BS38 carburetors | Electronic Fuel Injection | Weber Marelli CPU 5.9M, 54mm throttle bodies, electronic fuel injection | 44mm Keihin® fuel injection |
| Ignition: | Battery, induction coil | TCI | Digital CDI | TCI: Transistor Controlled Ignition |
| Starting: | Kick | Electric | Electric | Electric |
| Max Power: | 39.5 kW / 53 hp @ 7200 rpm | 86.2 hp / 63.4kW @ 7500 rpm | 100 kW / 136 hp @ 10200 rpm | NA |
| Max Torque: | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm | 88.8 Nm / 9.1 kgf-m @ 6000 rpm | 101 Nm / 74.4 lb-ft @ 8000 rpm | NA |
| Transmission: | 5 Speed | 6 speed | 6 Speed | 5-Speed, Wide-ratio constant-mesh |
| Final Drive: | Chain | Chain | Chain | O-ring chain |
| Front Suspension: | Telescopic forks | Telescopic fork | Öhlins upside down fork with 43 mm of condition pipe diameter, TiN coating | 48mm Kayaba spring-type fork with speed sensitive, damping; fully adjustable |
| Rear Suspension: | Dual shock absorbers | Swingarm Link-type | A arm rocker with progressively working Öhlins central shock strut | Swingarm, link suspension, mono shock, Kayaba single shock; fully adjustable |
| Front Brakes: | Single disc | 2 x 298mm discs with ABS | 2 x 320 mm Discs, 4 piston calipers | Single hydraulic single 270 mm disc 4 piston caliper |
| Rear Brakes: | Drum | Single 248mm disc with ABS | Single 220 mm disc, 2 piston caliper | Single 245 mm disc 2 piston caliper |
| Front Tyre: | 3.50-19 | 120/70 ZR18 | 120/70 ZR17 | 80/100-21 |
| Rear Tyre: | 4.00-18 | 160/60 ZR17 | 190/50 ZR17 | 120/90-18 |
| Dimensions: | Length: 2175 mm / 85.6" Width: 905 mm / 35.0" Height: 1135 mm / 44.7" | Length 2180 mm / 85.8 in Width 800 mm / 31.5 in Height 1290 mm / 50.8 in | Length 2030 mm / 79.9 in Width 780 mm / 30.7 in Height 1080 mm / 42.5 in | Length: 2165 mm / 85.2 in Width: 825 mm / 32.5 in Height: 1280 mm / 50.4 in |
| Wheelbase: | 1410 mm / 55.5" | 1485 mm / 58.5 in | 1410 mm / 55.5 in | 1465 mm / 57.7 in |
| Fuel Capacity: | 12.5 Litres / 3.3 US gal | 20 Litres / 5.2 US gal | 17 Litres / 4.5 US gal / 3.7 Imp gal | 7.5 Litres / 2.0 US gal |