AJS Model 31 650
| Production Year: | 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |  |
| Type: | air-cooled, four-stroke, parallel twin cylinder, OHV, 2 valves per cylinder |
| engine specs | |
| Type | air-cooled, four-stroke, parallel twin cylinder, OHV, 2 valves per cylinder |
| Displacement | 646 cm3 |
| Bore X Stroke | 2.8x3.1 in OR 71 mm |
| Compression Ratio | 7.5:1 |
| Horsepower | 43/6000 KW(hp)/RPM |
| Fuel System | carburetor |
| transmission specs | |
| Gearbox | 4-speed, manual |
| Clutch | wet multi-disc, manual |
| Final Drive | chain |
| chassis specs | |
| Frame | steel |
| Front Suspension | telescopic fork |
| Rear Suspension | dual shocks |
| Front Brake | drum |
| Rear Brake | drum |
| tyres specs | |
| Front | 3.25 -19 |
| Rear | 3.50 -19 |
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