AJS EOS 125 Mk2 (2012-14) vs Aprilia RS4 125 (2019-20) vs Yamaha SR 250 (1980-82)
Comparison technical specifications
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| Make: | AJS | Aprilia | Yamaha |
| Model: | EOS 125 Mk2 | RS4 125 | SR 250 |
| Years: | 2012-14 | 2019-20 | 1980-82 |
| Engine: | Twin cylinder, 4-stroke | Four stroke, single cylinder, DOHC, 4 valves | Four stroke, single cylinder, SOHC, 2 valve |
| Capacity: | 124 cc / 7.6 cub in | 124.8 cc / 7.6 cu in | 239 cc / 15.2 cu-in |
| Bore x Stroke: | 44 x 40 mm | 58 X 47 mm | 73.5 x 56.5 mm |
| Cooling System: | Liquid cooled | Liquid cooled | Air cooled |
| Ignition: | Coil, CDI | Electronic with CDI capacity discharge | Electronically |
| Starting: | Electric | Electric | Electric |
| Max Power: | 8 kW / 11 hp @ 9500 rpm | 11.7 kW / 16 hp @ 10500 rpm | 21 hp / 15.7 kW @ 7700 rpm |
| Transmission: | 5-Speed | 6 Speed | 5 Speed |
| Final Drive: | Chain | Chain: 60/13 (4.61) | Chain |
| Front Suspension: | Telescopic forks, USD | Ø41 mm Upside down fork | 32mm Telescopic forks |
| Rear Suspension: | Twin shock | Asymmetric swingarm with monoshock | Dual shock 5-way preload adjustment. |
| Front Brakes: | Twin disc | Single 300 mm disc, 4 piston caliper | Drum |
| Rear Brakes: | Single disc | Single 218 mm disc, 1 piston caliper | Drum |
| Front Tyre: | 80/90-21 | 110/80 17 | 3.00-18 |
| Rear Tyre: | 160/80-16 | 130/70 17 | 120/90-16 |
| Wheelbase: | 1860 mm / 73 in. | 1353 mm / 53.2 in | 1340 mm / 52.75 in |
| Seat Height: | 640 mm / 25 in | 820 mm / 32.3 in | 740 mm / 29.0 in |
| Fuel Capacity: | 14 L / 3.7 US gal | 14.5 Litres / 3.8 US gal | 10.8 Litres / 2.7 US gal |