| MODEL | AJS E95 PORCUPINE 1954 |
| Year | 1954 |
| Engine Type | Twin cylinder inclined at 45 degrees, aluminium alloy, DOHC |
| Displacement / Capacity | 497 cc / 30.3 cu in |
| Bore X Stroke | 68 x 68.5 mm |
| Compression Ratio | — |
| Cooling System | Air cooled |
| Max Power | 41 kW / 55 hp @ 7600 rpm |
| Max Torque | — |
| Ignition | Lucas magneto |
| Induction | Twin GP carburettors |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4-Speed, close ratio |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Dual down-tube steel cradle |
| Front Suspension | AMC Teledraulic telescopic fork |
| Rear Suspension | Dual AMC 'Jam-pot' shocks |
| Front Brakes | TLS drum, 203 mm / 8 in |
| Rear Brakes | SLS drum, 203 mm / 8 in |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 711 mm / 28 in |
| Wheelbase | 1435 mm / 56.5 in |
| Ground Clearance | — |
| Dry Weight | 152 kg / 335 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.0 x 19 |
| Rear Tyre | 3.5 x 19 |
| FUEL SYSTEM | |
| Fuel Capacity | 19 Litres / 5.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The final development of AJS's 500 cc Grand Prix twin, whose cylinders were tilted to 45 degrees to improve cooling and carburettor fitment, with the motor mounted lower in a loop frame and pannier-style fuel tanks in 1954. Originally conceived with a supercharger before the 1946 ban, the Porcupine family took AJS's only 500 cc world title in 1949 but was often temperamental. Just four E95s were made before AJS left Grand Prix racing at the end of 1954.
