Vespa Primavera 125 (2015-) vs AJS Model 31 650 (1957-66)
Comparison technical specifications
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| Make: | Vespa | AJS |
| Model: | Primavera 125 | Model 31 650 |
| Years: | 2015- | 1957-66 |
| Engine: | Four stroke, single cylinder, SOHC, 3 valve | Four stroke, pushrod parallel twin, OHV, 2 valves per cylinder, |
| Capacity: | 124.5 cc / 7.6 cub in | 646 cc / 39.4 cu in |
| Bore x Stroke: | 52 x 58.6 mm mm | 72 x 79.3 mm |
| Cooling System: | Air cooled, forced | Air cooled |
| Compression Ratio: | 10.5:1 | 7.5 : 1 |
| Ignition: | Electronic | 6 V (After 1964 12 V) Magnet (Lucas K2F) |
| Starting: | Electric | Kick |
| Max Power: | 7.8 kW / 10.6 hp @ 7700 rpm | 31,4 kW / 43 hp @ 6000 rpm |
| Clutch: | Automatic, dry centrifugal with vibration dampers | Multi Plate (dry, Burman) |
| Transmission: | CVT | 4 Speed |
| Final Drive: | Belt | Chain |
| Frame: | Sheet metal body with welded reinforcements | Single cradle |
| Front Suspension: | Single arm with coil spring and dual action mono shock absorber | Hydraulic telescopic fork |
| Rear Suspension: | Hydraulic monoshock | Dual chocks |
| Front Brakes: | Single Stainless steel 200mm disc, hydraulically operated | Drum |
| Rear Brakes: | Drum, 140 mm, mechanically operated | Drum |
| Wheels: | Die-cast aluminium alloy | Steel, wire spokes |
| Front Tyre: | 110/70-11 | 3.25 -19 |
| Rear Tyre: | 20/70-11 | 3.50 -19 |
| Dry Weight: | 115 kg / 254 lbs | 176 kg / 388 lbs |
| Fuel Capacity: | 8 Litres / 2.1 US gal | 16 L / 4.2 US gal |