| MODEL | NORTON 650SS 1968 |
| Year | 1968 |
| Engine Type | Four stroke, parallel twin, pushrod, 2 valves per cylinder |
| Displacement / Capacity | 647 cc / 39.5 cu in |
| Bore X Stroke | 68 x 89 mm |
| Compression Ratio | 8.9:1 |
| Cooling System | Air cooled |
| Max Power | 38.8 kW / 52 hp @ 6800 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | 2 x 30 mm Amal concentric carburettors |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Featherbed duplex steel cradle |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shocks, 5-way adjustable |
| Front Brakes | 203 mm drum |
| Rear Brakes | 178 mm drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 185 kg / 408 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 13.5 Litres / 3.6 US gal |
| Fuel Consumption | — |
| Top Speed | 185 km/h / 115 mph |
The 650SS was the sportier version of the 650 Dominator-based twin, in the Featherbed frame with twin carburettors and a higher state of tune. It was a fast, good-handling sports roadster of the late Featherbed era, shortly before the Commando replaced the range.
