Piaggio MP3 400 (2007-08) vs Aprilia RS 125 Poggiali Replica (2005) vs Yamaha FZ-1 Fazer (2007) vs Yamaha XS 400 (1977-78) vs Ariel Square Four 4G 1000, Mark I, Mark II (1936-48)
Comparison technical specifications
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| Make: | Piaggio | Aprilia | Yamaha | Yamaha | Ariel |
| Model: | MP3 400 | RS 125 Poggiali Replica | FZ-1 Fazer | XS 400 | Square Four 4G 1000, Mark I, Mark II |
| Years: | 2007-08 | 2005 | 2007 | 1977-78 | 1936-48 |
| Engine: | Four stroke, single cylinder, SOHC, 4 valve Piaggio MASTER, catalysed | Single cylinder, two stroke, reed valves induction | Four stroke, transverse four cylinder, DOHC, 5 valve per cylinder | Four stroke, 180° parallel twin, SOHC, 2 valves per cylinder | Four stroke, vertical square four, OHV, 8 valves |
| Capacity: | 398.9 cc / 24.3 cub in. | 125 cc / 7.6 cu in | 998 cc / 60.9 ci-in | 392 cc / 23.9 cu-in | 997 cc / 60.8 cu in |
| Bore x Stroke: | 69 x 85.5 mm | 54 x 54.5mm | 77 X 53.6 mm | 69.0 x 52.4 mm | 65 x 78 mm |
| Compression Ratio: | 10.5:1 | 14.5:1 | 11.5:1 | 9.2:1 | 6.0:1 |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled | Air cooled | Air cooled |
| Starting: | Electric | Electric | Electric | Electric & kick | Kick start |
| Max Power: | 25 kW / 34 hp @ 7500 rpm | 21 kW / 28 hp @ 10500 rpm | 146.8 hp / 108 kW @ 11000 rpm | 36 hp / 26.8 kW @ 8100 rpm | F4 G, Mk I: 26 kW / 35 hp @ 5500 rpm Mk II: 34 kW / 45 hp @ 5500 rpm |
| Transmission: | CVT, Twist and go | 6 Speed | 6 Speed | 6 Speed | 4-Speed |
| Wheelbase: | 1549 mm / 61 in. | 1345 mm / 53.0 in | 1461 mm / 57.5 in | 1364 mm / 53.7 in | 1422 mm / 56 in |
| Front Suspension: | Parallelogram composed of four aluminium arms supporting two steering tubes cantilevers | Upside-down forks, Ø 40mm | Telescopic upside forks, | Telescopic fork | Telescopic fork |
| Rear Suspension: | Two dual effect hydraulic shock absorbers and adjustable spring pre-load | Monoshock | Link-type swingarm, | Dual shocks swing arm, preload adjustable | Plunger-link spring |
| Front Brakes: | 2 x 240mm discs 2 piston caliper | Single 320 mm discs, 4 piston caliper | 2x 320mm discs 4 piston calipers | Single disc | Drum |
| Rear Brakes: | Single 240mm disc, 2 piston caliper | Single 240 mm disc, 2 piston caliper | Single 245mm disc 1 piston caliper | Drum | Drum |
| Fuel Capacity: | 12 Litres / 3.2 US gal | 14 L / 3.7 US gal | 18 Litres / 4.76 gal | 14 Litres / 3.7 US gal | 23 L / 6.0 US gal |