Yamaha XJ 900R Seca (1983-84) vs Yamaha RD 125LC YPVS (1983-84)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XJ 900R Seca | RD 125LC YPVS |
| Years: | 1983-84 | 1983-84 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder. | Two stroke, single cylinder |
| Capacity: | 853 cc / 52 cu-in | 123 cc / 7.5 cu-in |
| Bore x Stroke: | 67 х 60.5 mm | 56 х 50 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 9.2:1 | 6.4:1 |
| Induction: | 4x 35mm Mikuni carburetor | 24mm Mikuni carburetors |
| Ignition: | CDI | Hitachi CDI |
| Starting: | Electric | Kick |
| Max Power: | 97 hp / 70.8 Nm @ 9000 rpm | 20 hp / 15.5 kW @ 9500 rpm |
| Max Torque: | 80.2 Nm / 59.3 lb-ft @ 5000 rpm | 1.6 kgf-m / 16 Nm @ 9250 rpm |
| Transmission: | 5 Speed | 6 Speed |
| Final Drive: | Shaft | Chain |
| Front Suspension: | Air assisted telescopic forks, | 32mm Telescopic forks |
| Rear Suspension: | Twin strut gas assisted, 5 spring preload and 12 damping adjustable, | Monocross linkage 6-way preload adjustment |
| Front Brakes: | 2x 254mm discs | Single 245mm disc |
| Rear Brakes: | Single 254mm disc | 130mm Drum |
| Front Tyre: | 100/90-18 | 2.75-18-4PR |
| Rear Tyre: | 120/90-18 | 3.00-18-6PR |
| Wheelbase: | 1480 mm / 58.2 in | 1295 mm / 50.9 in |
| Seat Height: | 780mm / 30.7 in | 775 mm / 30.5 in |
| Ground clearance: | 145mm / 5.7 in | 185 mm / 7.2 in |
| Fuel Capacity: | 22 Litres / 5.8 US gal | 13 Litres / 3.4 US gal |
| Standing ¼ Mile: | 11.8 sec / 112.3 mph | 16.7 sec |
| Top Speed: | 213 km/h / 132.5 mph | 81 mph / 130.3 km/h |