Sunbeam B1 (1957-64) vs KTM 300 EXC Enduro (2003-04) vs Kawasaki ER-6n (2016) vs ATK 125 2-Stroke (2003)
Comparison technical specifications
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| Make: | Sunbeam | KTM | Kawasaki | ATK |
| Model: | B1 | 300 EXC Enduro | ER-6n | 125 2-Stroke |
| Years: | 1957-64 | 2003-04 | 2016 | 2003 |
| Engine: | Parallel twin cylinder, 4 stroke | Two stroke, single cylinder | Four stroke, parallel twin, DOHC, 4 valves per cylinder. | Two stroke, single cylinder |
| Capacity: | 250 cc / 15.3 cu in | 293 cc / 17.9 cu in | 649 cc / 39.6 cu-in | 125 cc / 7.7 cu in |
| Cooling System: | Forced air cooled | Liquid cooled | Liquid cooled, | Liquid cooled |
| Compression Ratio: | 6.5:1 | 11.0:1 | 11.3;1 | 11.2:1 |
| Transmission: | Four speed | 5 Speed | 6 Speed | 6-Speed |
| Final Drive: | Enclosed chain in oil bath | Chain, Regina O-ring | Chain | Chain |
| Front Brakes: | Drum, 127 mm diameter | Single260 mm disc, 2 piston caliper | 2x 300mm discs 2 piston Calipers | Single disc, 260 mm, 2-piston caliper |
| Rear Brakes: | Drum, 127 mm diameter | Single 220 mm disc, 1 piston caliper | Single 220mm disc 1 piston Caliper | Single disc, 220 mm, 1-piston caliper |