Yamaha WR 400F (1998-00) vs Yamaha XSR 155 (2021)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | WR 400F | XSR 155 |
| Years: | 1998-00 | 2021 |
| Engine: | Four stroke, single cylinder, DOHC, 5 valve | Four stroke, single cylinder, SOHC, 4 valve with variable valve actuation |
| Capacity: | 399 cc / 24.3 cu-in | 155.1 cc / 9.14 cu-in |
| Bore x Stroke: | 92.0 x 60.1mm | 58.0 × 58.7 mm |
| Cooling System: | Lliquid cooled | Liquid cooled |
| Compression Ratio: | 12.5:1 | 11.6:1 |
| Induction: | Keihin 39mm FCR, accelerator pump, throttle positioning sensor | Fuel Injection |
| Ignition: | CDI | TCI |
| Starting: | Kick | Electric |
| Max Power: | 48 hp / 35.3 kW @ 8000 rpm | 14.1 kW / 19 hp @ 10000 rpm |
| Max Torque: | 39 Nm / @ 7500 rpm | 14.7 Nm / 40.8 lb-ft @ 8500 rpm |
| Transmission: | 5 Speed | 6 Speed slip-and-assist clutch |
| Final Drive: | Chain | Chain |
| Front Suspension: | Inverted 46mm Kayaba forks with | Upside-down Telescopic fork |
| Rear Suspension: | Monocross Kayaba | Monoshock operating on a die-cast aluminium swingarm |
| Front Brakes: | Single 245mm disc 4 piston caliper | Single 282mm disc 2 piston caliper, ABS |
| Rear Brakes: | Single 220mm disc 2 piston caliper | Single 240mm disc 1 piston caliper, ABS |
| Front Tyre: | 80/100-21 | 110/70 -17 |
| Rear Tyre: | 110/100-18 | 140/70 -17 |
| Wheelbase: | 1480 mm / 58.3 in | 1330 mm / 52.3 in |
| Seat height: | 991 mm / 39.0 in | 810 mm / 31.8 in |
| Ground Clearance: | 373 mm / 14.7 in | 170 mm / 6.6 in |
| Fuel Capacity: | 8 Litres / 2.1 US gal | 10 Litres / 2.6 US gal |