Yamaha YBR 125 Custom (2007-) vs Yamaha XT 550 (1982) vs Kawasaki ZZ-R 1100 D (1999) vs Yamaha YZF R6S (2006-07)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Kawasaki | Yamaha |
| Model: | YBR 125 Custom | XT 550 | ZZ-R 1100 D | YZF R6S |
| Years: | 2007- | 1982 | 1999 | 2006-07 |
| Engine: | Four stroke, single cylinder, SOHC, 2 valves | Four stroke, single cylinder, SOHC, 4 valve | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. |
| Capacity: | 124 cc / 7.6 cu-in | 558 cc / 34.0 cu-in | 1052 cc / 64.1 cu-in | 599 cc / 36.5 cu-in |
| Bore x Stroke: | 54 x 54 mm | 92 X 84 mm | 11.0:1 | 67 x 42.5 mm |
| Cooling System: | Air cooled | Air cooled | Liquid cooled, | Liquid cooled |
| Compression Ratio: | 10.0:1 | 8.5:1 | 76 x 58 mm | 12.8:1 |
| Induction: | Fuel infection | 26mm TK carburetor | 4x Keihin CVKD40 carbs | Fuel Injection |
| Ignition: | CDI | CDI | Battery and coil (transistorized) | Digital TCI |
| Starting: | Electric & kick | Kick | Electric | Electric |
| Max Power: | 10.1 hp / 7.4 kW @ 7800 rrpm | 38 hp / 27.7 kW @ 6500 rpm | 147 hp / 108 kW @ 10500 rpm | 127 hp / 94.7 kW @14500 rpm |
| Max Torque: | 10 Nm @ 7400 rpm | .4.5 kg-m / 44.0 Nm @ 5500 rpm | 110 Nm / 11.2 kgf-m @ 8500 rpm | 66 Nm / 48.6 lb-ft @ 1100 rpm |
| Transmission: | 5 Speed | 5 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic forks | 38mm Air assisted forks | 43mm forks preload and rebound adjustable. | 41mm upside down forks with 2-way compression damping adjustable |
| Rear Suspension: | Bottom link swingarm | Monoshock adjustable preload | Monoshock fully adjustable. | Fully adjustable rear shock absorber with 2-way compression damping |
| Front Brakes: | Single 245mm disc | Drum | 2x 320mm discs 4 piston calipers | 2x 320mm discs |
| Rear Brakes: | Drum | Drum | Single 240mm disc 1 piston caliper | Single 220mm disc |
| Front Tyre: | 90/90-M21 | 3.00S-21-4PR | 120/70 VR17 | 120/70 ZR17 |
| Rear Tyre: | 90/90-M18 | 4.60S-18-4PR | 180/55 VR17 | 180/55 ZR17 |
| Fuel Capacity: | 12 Litres / 3.4 US gal | 14 Litres / 3.6 US gal | 24 Litres / 6.3 us gal | 17.5 Litres / 4.6 US gal |