Velocette MAC (post war) (1946-59) vs Yamaha SR 400SP (1979)
Comparison technical specifications
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| Make: | Velocette | Yamaha |
| Model: | MAC (post war) | SR 400SP |
| Years: | 1946-59 | 1979 |
| Engine: | Four stroke, single cylinder, OHV | Four stroke, single cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 349 cc / 21.3 cub in | 399 cc / 24.3 cu-in |
| Bore x Stroke: | 68.5 x 96 mm | 87 х 67.2 mm |
| Compression Ratio: | 6.75:1 (from 1951) | 8.5:1 |
| Cooling System: | Air cooled | Air cooled |
| Lubrication: | Dry sump | Dry sump |
| Ignition: | Lucas K2F magneto | CDI |
| Starting: | Kick start | Kick |
| Max Power: | 11 kW / 15 hp @ 6300 rpm | 27 hp / 17.1 KW @ 7000 rpm |
| Clutch: | Three-plate | Wet, Multiple Disc |
| Transmission: | 4 Speed | 5 Speed |
| Final Drive: | Chain | Chain |
| Frame: | Single top and front down tubes and twin tube cradle | Steel Double Cradle |
| Wheelbase: | 1276 mm / 50.25 in. | 1410 mm / 55.5 IN |
| Seat height: | 700 mm / 27.5 in. | 790 mm / 30.9 in |
| Front Suspension: | Pre war: Webb girder style Post war: Air-sprung Dowty Oleomatic forks | 35mm Telescopic fork |
| Rear Suspension: | Hydraulic shocks | Dual shocks, 5-way adjustable preload |
| Front Brakes: | 7 in., drum | Single disc |
| Rear Brakes: | 6 in., drum | Drum |
| Front Tyre: | 3.25 x 19 in | 3.50-19 |
| Rear Tyre: | 3.25 x 19 in | 4.00-16 |
| Fuel Capacity: | 11.4 L / 3 US gal | 12 Litres / 3.2 gal |