Yamaha XS 250 Special (1980-81) vs Yamaha YZF 600R Thundercat (2005-07)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XS 250 Special | YZF 600R Thundercat |
| Years: | 1980-81 | 2005-07 |
| Engine: | Four stroke, 180° parallel twin, SOHC, 2 valves per cylinder | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 248 cc / 15.2 cu-in | 599 cc / 36.5 cu-in |
| Bore x Stroke: | 55 х 52.4 mm | 62 x 49.6 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 9.3:1 | 12.0:1 |
| Induction: | 2x 32mm Mikuni carburetors | 4 x 36 mm Keihin CV downdraft carburetors |
| Ignition: | Coil and cb | Digital TCI |
| Starting: | Kick | Electric |
| Max Power: | 26 hp / 20.1 kW @ 9500 rpm | 72.9 kW / 100 hp @ 11500 rpm |
| Max Torque: | 2.1 kgf-m / 15.2 lb-ft @ 8500 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: | Welded tubular. Double cradle with single downtube | Twin spar, steel, delta box |
| Front Suspension: | Telescopic forks | 41 mm telescopic fork adjustable preload, compression and rebound damping |
| Rear Suspension: | Dual shocks, swing arm, 5-position preload adjustable | Monoshock adjustable preload, bump and rebound |
| Front Brakes: | Single 267mm disc | 2x 300 mm Discs, 4 piston calipers |
| Rear Brakes: | 160mm Drum | Single 245mm disc, 2 piston caliper |
| Front Tyre: | 3.00-18 | 120/60-17 |
| Rear Tyre: | 120/90 x 16 | 160/60-17 |
| Rake: | 27° | 25.0° |
| Trail: | 87 mm / 3.43 in | 97 mm / 3.82 in |
| Wheelbase: | 1375 mm / 54.1 in | 1415 mm / 55.7 in |
| Seat Height: | 770 mm / 30.3 in | 810 mm / 31.7 in |
| Dry Weight: | 169 kg / 373 lbs | 189 kg / 417 lbs |
| Fuel Capacity: | 14 Litres / 3.7 US gal | 19 Litres / 5.0 US gal / 4.2 Imp gal |