Yamaha XS 650 / XS 650D (1977) vs Yamaha RZ 125S (1983-84)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XS 650 / XS 650D | RZ 125S |
| Years: | 1977 | 1983-84 |
| Engine: | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. | Two stroke, single cylinder |
| Capacity: | 653 cc / 39.8 cu in | 123 cc / 7.5 cu-in |
| Bore x Stroke: | 75 x 74 mm | 56 х 50 mm |
| Compression Ratio: | 8.4:1 | 6.4:1 |
| Cooling System: | Air cooled | Liquid cooled |
| Lubrication: | Wet sump | Autolube |
| Induction: | 2 x Mikuni BS38 carburetors | 24mm Mikuni carburetors |
| Ignition: | Battery, induction coil | Hitachi CDI |
| Starting: | Electric and kick | Kick |
| Max Power: | 39.5 kW / 53 hp @ 7200 rpm | 20 hp / 15.5 kW @ 9500 rpm |
| Max Torque: | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm | 1.6 kgf-m / 16 Nm @ 9250 rpm |
| Transmission: | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Telescopic forks | 32mm Telescopic forks |
| Rear Suspension: | Dual shock absorbers | Monocross linkage 6-way preload adjustment |
| Front Brakes: | Twin hydraulic discs, 267 mm | Single 245mm disc |
| Rear Brakes: | Drum | 130mm Drum |
| Front Tyre: | 3.50H-19 4PR | 2.75-18-4PR |
| Rear Tyre: | 4.00H-18 4PR | 3.00-18-6PR |
| Dimensions: | Length: 2175 mm / 85.6" Width: 780 mm / 30.7" Height: 1090 mm / 42.9" | Length 1990 mm / 78.3 in Width 735 mm / 28.9 in Height 1190 mm / 46.8 in |
| Wheelbase: | 1435 mm / 56.5" | 1295 mm / 50.9 in |
| Ground Clearance: | 150 mm / 5.5" | 185 mm / 7.2 in |
| Seat Height: | 810 mm / 31.9" | 775 mm / 30.5 in |
| Dry Weight: | 191 kg / 420 lbs | 98 kg / 216 lbs |
| Fuel Capacity: | 15 Litres / 4.0 US gal | 13 Litres / 3.4 US gal |
| Oil Capacity: | 2.5 Litres / 2.6 US qts | 1.1 L |
| Top Speed: | 185 km/h / 115 mph | 81 mph / 130.3 km/h |