Vespa 90, 90 SS and 90 Racer (1963-84) vs Yamaha XS 650 / TX 650 (1980-81) vs Vespa ET2 50 (1996-00)
Comparison technical specifications
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| Make: | Vespa | Yamaha | Vespa |
| Model: | 90, 90 SS and 90 Racer | XS 650 / TX 650 | ET2 50 |
| Years: | 1963-84 | 1980-81 | 1996-00 |
| Engine: | Two stroke, single cylinder | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. | Two stroke, single cylinder |
| Capacity: | 88.5 cc / 5.4 cub in | 653 cc / 39.8 cu in | 49.3 cc / 3.0 cub in |
| Compression Ratio: | 8.7:1 | 8.4:1 | 11:1 |
| Ignition: | Flywheel magneto coil | Battery, induction coil | Electric |
| Starting: | Kick start | Electric and kick | Kick start |
| Max Power: | 4.4 kW / 6 hp @ 6000rpm | 39.5 kW / 53 hp @ 7200 rpm | 3 kW / 5.1 hp @ 7500 rpm |
| Transmission: | 3 gears (4 gears for the SS and Racer) | 5 Speed | Centrifugal automatic gearbox |
| Final Drive: | Direct drive | Chain | Belt |
| Front Suspension: | Coil spring and hydraulic shock absorber | Telescopic forks | Hydraulic single shock |
| Rear Suspension: | Coil spring and hydraulic shock absorber | Dual shock absorbers | Hydraulic single shock |
| Front Brakes: | 125 mm drum | Twin hydraulic discs, 267 mm | 200 mm disc |
| Rear Brakes: | 150 mm drum | Drum | 110 mm drum |
| Front Tyre: | 3 x 10" | 3.50H-19 4PR | 100/80-10" |
| Rear Tyre: | 3 x 10" | 4.00H-18 4PR | 120/70-10" |
| Dimensions: | Length: 1665 mm / 65.6 in Width: 670 mm / 26.4 in Height: 1015 mm / 40.0 in | Length: 2175 mm / 85.6" Width: 780 mm / 30.7" Height: 1090 mm / 42.9" | Length: 1760 mm / 69.3 in Width: 670 mm / 26.4 in |
| Wheelbase: | 1180 mm / 46.5 in | 1435 mm / 56.5" | 1280 mm / 50.4 in |
| Fuel Capacity: | 5.2 L / 1.3 US gal | 15 Litres / 4.0 US gal | 9 L / 2.4 US gal |
| Top Speed: | 93 km/h / 57.8 mph | 185 km/h / 115 mph | 45 km/h / 28 mph |