Yamaha XT 500 (1979) vs Yamaha SR 400 (1993-97) vs Yamaha YS 125 (2017) vs Yamaha XS 650F (1979)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | XT 500 | SR 400 | YS 125 | XS 650F |
| Years: | 1979 | 1993-97 | 2017 | 1979 |
| Engine: | Four stroke, single cylinder, SOHC, 2 valve | Four stroke, single cylinder, SOHC, 2 valves per cylinder. | Four stroke, single cylinder, SOHC, 2 valves | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 499 cc / 30.5 cuin | 399 cc / 24.3 cu-in | 124 cc / 7.6 cu-in | 653 cc / 39.8 cu in |
| Bore x Stroke: | 87 х 84 mm | 87 х 67.2 mm | 52.4 x 57.9 mm | 75 x 74 mm |
| Cooling System: | Air cooled | Air cooled | Air cooled | Air cooled |
| Compression Ratio: | 9.0 :1 | 8.5:1 | 10.0:1 | 8.4:1 |
| Induction: | 32mm Mikuni VM32SS carburetor | BSR33 carburetor | Fuel infection | 2 x Mikuni BS38 carburetors |
| Ignition: | Magneto, CB/coil | CDI | TCI | Battery, induction coil |
| Starting: | Kick | Kick | Electric & kick | Electric and kick |
| Max Power: | 32 hp / 23.5 kW @ 6500 rpm | 27 hp / 17.1 KW @ 7000 rpm | 7.8 kW / 10.4 hp @ 7500 rpm | 39.5 kW / 53 hp @ 7200 rpm |
| Max Torque: | 4.0 kgf-m / 39.2 Nm @ 5500 rpm | 27.4 Nm / 6.3 kgf-m @ 6500 rpm | 10.8 Nm / 1.1 kg-m @ 6000 rpm | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm |
| Transmission: | 5 Speed | 5 Speed | 5 Speed Constant Mesh | 5 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Front Suspension: | Leading axle coil spring fork | Telescopic fork | Telescopic forks | Telescopic forks |
| Rear Suspension: | Swing arm adjustable preload | Dual shocks | Bottom link swingarm | Dual shock absorbers |
| Front Brakes: | Single 160mm drum | Single disc | Single 245mm disc | Twin hydraulic discs, 267 mm |
| Rear Brakes: | Single 150mm drum | Drum | 120mm Drum | Drum |
| Front Tyre: | 3.00-21 | 3.50-19 | 2.75-18-42P | 3.50H-19 4PR |
| Rear Tyre: | 4.00-18 | 4.00-16 | 100/80-18-59P | 4.00H-18 4PR |
| Wheelbase: | 1475 mm / 58.0 in | 1410 mm / 55.5 IN | 1320 mm / 51.9 in | 1435 mm / 56.5" |
| Seat Height: | 840 mm / 33.0 in | 790 mm / 30.9 in | 795 mm / 31.2 in | 810 mm / 31.9" |
| Fuel Capacity: | 8.8 Litres / 2.3 US gal | 12 Litres / 3.2 gal | 14 Litres / 3.6 US gal | 15 Litres / 4.0 US gal |