Kawasaki Z 400 (1977-79) vs Yamaha XS 1100LH Midnight Special (1981) vs Aprilia RS 125 Poggiali Replica (2005)
Comparison technical specifications
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| Make: | Kawasaki | Yamaha | Aprilia |
| Model: | Z 400 | XS 1100LH Midnight Special | RS 125 Poggiali Replica |
| Years: | 1977-79 | 1981 | 2005 |
| Engine: | Four stroke, parallel twin cylinder, SOHC, 2 Valve per cylinder. | Four stroke transverse four cylinder, DOHC, 2 valves per cylinder. | Single cylinder, two stroke, reed valves induction |
| Capacity: | 398 cc / 24.2 cu-in | 1101 cc / 67.2 cu-in | 125 cc / 7.6 cu in |
| Bore x Stroke: | 64 х 62 mm | 71.5 x 68.6 mm | 54 x 54.5mm |
| Compression Ratio: | 9.4:1 | 9.2:1 | 14.5:1 |
| Cooling System: | Air cooled | Air cooled | Liquid cooled |
| Induction: | 2x Keihin CV32 6caburetor | 4x Mikuni BS 34SS Carburettor | Dell'Orto VHSB 34LD |
| Ignition: | Battery & coil | TCI additional vacuum adjusted! / electric kick starter - Witch is separated from the engine, for emergency mounting only | Electronic |
| Starting: | Electric & kick | Electric | Electric |
| Max Power: | 36 hp / 26.8 kW @ 8500 rpm | 95 hp / 70.8 kW @ 8500 rpm | 21 kW / 28 hp @ 10500 rpm |
| Max Torque: | 3.3 kgf-m / 23.8 lb-ft @ 7500 rpm | 9.2 kgf-m / 66.5 lb-ft @ 6500 rpm | 19 Nm / 1.9 kgf-m / 14.1 lb-ft @ 9000 rpm |
| Transmission: | 5 Speed | 5 Speed | 6 Speed |
| Final Drive: | Chain | Shaft | Chain |
| Front Suspension: | Telescopic fork | Telescopic fork. | Upside-down forks, Ø 40mm |
| Rear Suspension: | Swing arm | Dual shocks Swing arm, preload adjustable | Monoshock |
| Front Brakes: | Single 226mm disc | 2x 298mm discs | Single 320 mm discs, 4 piston caliper |
| Rear Brakes: | 180mm Drum | Single 298mm disc | Single 240 mm disc, 2 piston caliper |
| Front Tyre: | 3.25 - S18 4PR | 3.50-19 | 110/70-17 |
| Rear Tyre: | 3.50 - SIB 4PR | 130/90 -16 | 150/60-17 |
| Fuel Capacity: | 14 Litres / 3.6 US gal | 15 Litres / 3.9 US gal | 14 L / 3.7 US gal |
| Top Speed: | 94 mp/h | 126 mph / 202.8 km/h | 155 km/h / 96 mph |