Yamaha XJ 650 Seca (1981) vs BMW G 450X (2008)
Comparison technical specifications
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| Make: | Yamaha | BMW |
| Model: | XJ 650 Seca | G 450X |
| Years: | 1981 | 2008 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder, | Four stroke, single cylinder, DOHC, 4 valve |
| Capacity: | 653 cc / 39.8 cu-in | 449 cc / 27.4 cub. in. |
| Bore x Stroke: | 63 х 52.4 mm | 98 x 59 mm |
| Compression Ratio: | 9.2:1 | 12.0 :1 |
| Induction: | 4x 32mm Hitachi carburetors | Electronic fuel injection |
| Starting: | Electric | Electric |
| Max Power: | 71 hp / 51.8 kW @ 9400 rpm | 30.7 kW / 41 hp @ 7000 rpm |
| Max Torque: | 57 Nm / 42 lb-ft @ 7500 rpm | 43 Nm / 4.4 kgf-m / 32 lb-ft @ 6500 rpm |
| Clutch: | Wet Multiplate; 7 Steel 8 Friction | Multiple plate in oil bath |
| Transmission: | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Chain |
| Gear Ratio: | 1st 2.187 (35/16) 2nd 1.500 (30/20) 3rd 1.153 (30/26) 4th 0.933 (28/30) 5th 0.812 (26/32) | 1st 2.46 / 2nd 1.71 / 3rd 1.35 / 4th 1.04 / 5th 0.88:1 |
| Frame: | Tubular steel dual cradle frame | Stainless Steel Precision Tube |
| Front Suspension: | 36mm Kayaba forks | 45mm Upside-down forks |
| Front Wheel Travel: | 142 mm / 5.5 in | 300 mm / 11.8 in |
| Rear Suspension: | Duel Kayaba shocks | Direct Mounted Öhlins Shock |
| Rear Wheel Travel: | 93 mm / 3.6 in | 320 mm / 12.6 in |
| Front Brakes: | 2x 268mm disc 1 piston calipers | Single 260mm disc, 2 piston floating caliper |
| Rear Brakes: | Drum | Single 220mm disc, 1 piston floating caliper |
| Front Tyre: | 3.25-19 | 90/90-21 |
| Rear Tyre: | 120/90-18 | 140/80-18 |
| Wheelbase: | 1445 mm / 56.8 in | 1475 mm / 58.1 in |
| Seat Height: | 780 mm / 30.7 in | 911 mm / 35.9 in |
| Dry Weight: | 206 kg / 465 lbs | 111 kg / 245 lbs |
| Fuel Capacity: | 19.5 Litres / 5.1 US gal | 8 Litres / 2.1 US gal |