Comparison of James Comet 1957 and Simplex Automatic 1958 [S]ave
| Attribute |  Simplex Automatic 1958 × |  James Comet 1957 × |
|---|---|---|
| General | ||
| Production from (year) | 1958 | 1957 |
| Make | Simplex | James |
| Model | Simplex Automatic | James Comet |
| Category | Allround | Naked bike |
| Engine and transmission | ||
| Engine type | Single cylinder, two-stroke | Single cylinder, two-stroke |
| Fuel system | Carburettor | Carburettor |
| Displacement (cm³) | 130 | 98 |
| Power (kw) | 2.9 | - |
| Cooling system | - | Air |
| Transmission type,final drive | Belt | Chain |
| Bore (mm) | 50.8 | 47 |
| Stroke (mm) | 64.3 | 57 |
| Fuel control | Overhead Valves (OHV) | - |
| Ignition | Magneto | Magneto |
| Clutch | Variable speed automatic | - |
| Lubrication system | - | Wet sump |
| Compression | 6.5:1 | - |
| Chassis | ||
| Front suspension | Leading link | Hydralic telescopic forks |
| Rear suspension | Rigid | - |
| Front brakes | - | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Frame type | - | Single cradle |
| Front tyre | - | 2.75-19 |
| Rear tyre | - | 2.75-19 |
| Dimensions | ||
| Dry weight (kg) | 61 | 75 |
| Power/weight ratio | 0.0474 | - |
| Performance | ||
| Fuel capacity (l) | 9.46 | 10.2 |
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