Yamaha XS 400 (1979-) vs Yamaha YZF 600R Thundercat (2002)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XS 400 | YZF 600R Thundercat |
| Years: | 1979- | 2002 |
| Engine: | Four stroke, 180° parallel twin, SOHC, 2 valves per cylinder | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 392 cc / 23.9 cu-in | 599 cc / 36.5 cu-in |
| Bore x Stroke: | 69.0 x 52.4 mm | 62 x 49.6 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 9.2:1 | 12.0:1 |
| Induction: | 2x Mikuni BS32 carburetors | 4 x 36 mm Keihin CV downdraft carburetors |
| Ignition: | Battery ignition - With contact breaker points | Digital TCI |
| Starting: | Electric & kick | Electric |
| Max Power: | 36 hp / 26.8 kW @ 8100 rpm | 72.9 kW / 100 hp @ 11500 rpm |
| Max Torque: | 3.3 kgf-m / 23.8 lb-ft @ 8000 rpm | 65.7 Nm / 6.7 kgf-m / 48.7 lb-ft @ 9500 rpm |
| Transmission: | 6 Speed | 6 Speed |
| Final Drive: | Chain | 530 O-ring chain OEM sprocket sizes per tooth Front= 15 Back= 47 |
| Frame: | Tubular steel, semi-double cradle | Twin spar, steel, delta box |
| Front Suspension: | Telescopic fork | 41 mm telescopic fork adjustable preload, compression and rebound damping |
| Rear Suspension: | Dual shocks swing arm, preload adjustable | Monoshock adjustable preload, bump and rebound |
| Front Brakes: | Single disc | 2x 300 mm Discs, 4 piston calipers |
| Rear Brakes: | Drum | Single 245mm disc, 2 piston caliper |
| Front Tyre: | 3.00-18 | 120/60-17 |
| Rear Tyre: | 3.50-18 | 160/60-17 |
| Wheelbase: | 1364 mm / 53.7 in | 1415 mm / 55.7 in |
| Seat Height: | 780 mm / 30.7 in | 810 mm / 31.7 in |
| Wet Weight: | 182 kg / 401 lbs | 210 kg / 463 lbs |
| Fuel Capacity: | 14 Litres / 3.7 US gal | 19 Litres / 5.0 US gal / 4.2 Imp gal |