Yamaha YZF-R 25 (2021) vs Norton Commando 850 (1974)
Comparison technical specifications
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| Make: | Yamaha | Norton |
| Model: | YZF-R 25 | Commando 850 |
| Years: | 2021 | 1974 |
| Engine: | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder | Four stroke, parallel twin cylinder, push rod 2 valves per cylinder. |
| Capacity: | 249 cc / 15.1 cu-in | 829 cc / 50.6 cu in |
| Bore x Stroke: | 60 x 44.1 mm | 77 x 89 mm |
| Cooling System: | Liquid cooled | Air cooled |
| Compression Ratio: | 11.6:1 | 8.5:1 |
| Induction: | Electronic Fuel Injection | 2 x Amal carburetors |
| Ignition: | TCI: Transistor Controlled Ignition | Lucas alternator |
| Starting: | Electric | Kick |
| Max Power: | 26.5 kW / 36 PS @ 12,000 rpm | 60 hp / 44.7 kW @ 6200 rpm |
| Clutch: | Wet, multiple-disc coil spring | Diaphragm type pressure plate |
| Transmission: | Constant Mesh, 6-speed | 4 Speed |
| Final Drive: | Chain | Chain |
| Frame: | Diamond | Twin downtube cradle with Isolastic engine mounts |
| Front Suspension: | 41mm KYB telescopic fork | Telescopic fork |
| Rear Suspension: | KYB monocross | Dual shocks |
| Front Brakes: | Single 298mm disc 2 piston caliper | Single disc |
| Rear Brakes: | Single 220mm disc | Drum |
| Front Tyre: | 110/70-17M/C 54S | 4.10-19 |
| Rear Tyre: | 140/70-17M/C 66S | 4.10-19 |
| Wheelbase: | 1379.2 mm / 54.3 in | 1440 mm / 56.7 in |
| Fuel Capacity: | 14.3 Litres / 3.7 US gal | 19 Litres / 5.0 US gal |