Yamaha RD / RZ 125LC (1981-82) vs BMW G 650 X Challenge (2008)
Comparison technical specifications
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| Make: | Yamaha | BMW |
| Model: | RD / RZ 125LC | G 650 X Challenge |
| Years: | 1981-82 | 2008 |
| Engine: | Two stroke, single cylinder | Four stroke, single cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 123 cc / 7.5 cu-in | 652 cc / 39.8 cub in. |
| Bore x Stroke: | 56 х 50 mm | 100 x 83 mm |
| Compression Ratio: | 6.4:1 | 11.5:1 |
| Lubrication: | Autolube | Dry sump |
| Induction: | 24mm Mikuni carburetors | Fuel induction |
| Ignition: | Hitachi CDI | Capacitor Discharge Ignition system |
| Starting: | Kick | Electric |
| Max Power: | 20 hp / 15.5 kW @ 9500 rpm | 39 kW / 53 hp @ 7000 rpm |
| Max Torque: | 1.6 kgf-m / 16 Nm @ 9250 rpm | 60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5250 rpm |
| Transmission: | 6 Speed | 5 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | 32mm Telescopic forks | ∅45mm Upside-down telescopic fork |
| Rear Suspension: | Monocross linkage 6-way preload adjustment | Aluminum 2-unit cast swing arm, air damping |
| Front Brakes: | Single 245mm disc | Single ∅300mm disc, 2 piston calipers |
| Rear Brakes: | 130mm Drum | Single ∅240mm disc, 1 piston calipers |
| Front Tyre: | 2.75-18-4PR | 90/90 S 21 |
| Rear Tyre: | 3.00-18-6PR | 120/70 S 18 |
| Dimensions: | Length 1990 mm / 78.3 in Width 735 mm / 28.9 in Height 1190 mm / 46.8 in | Length: 2205 mm / 86.8 in. Width: 907 mm / 35.7 in. (incl. mirrors) Height: 1255 mm / 49.4 in. (excl. mirrors) |
| Wheelbase: | 1295 mm / 50.9 in | 1500 mm / 59.1 in. |
| Seat Height: | 775 mm / 30.5 in | 930 mm / 36.6 in (low seat: 910 mm / 35.8 in.) |
| Dry Weight: | 98 kg / 216 lbs | 144 kg / 317 lbs. |
| Fuel Capacity: | 13 Litres / 3.4 US gal | 9.5 Litres / 2.5 US gal |
| Consumption Average: | 64 mpg | 5.2 L/100 km / 19.3 km/l / 45.4 US mpg |
| Standing ¼ Mile: | 16.7 sec | 14.0 sec |
| Top Speed: | 81 mph / 130.3 km/h | 162.9 km/h / 101 mph. |