AJS Model 31650 CSR Hurricane

Make Model	AJS Model 31 650
Year	1963
Engine	Air cooled, four stroke, pushrod parallel twin, OHV. 2 valve per cylinder,
Capacity	646
Bore x Stroke	72 x 79,3 mm72 x 72.8mm
Compression Ratio	7,5 : 1
Induction	Carburetor
Ignition  /  Starting	6 Volt na 1964 12 Volt  Magnet (Lucas K2F)   /  kick
Clutch	Multi Plate (dry, Burman)
Max Power	31,4 KW 43 hp @ 6000 rpm
Transmission  /  Drive	4 Speed  /  chain
Frame	Single cradle
Front Suspension	Hydraulic telescopic fork
Rear Suspension	Dual chocks
Front Brakes	Drum
Rear Brakes	Drum
Front Tyre	3.25 -19
Rear Tyre	3.50 -19
Weight	176 kg
Fuel Capacity	16 Litres

The AJS Model 31 CSR designation officially stood for Competition / Sport / Road but it was dubbed the Coffee Shop Racer by its rivals.[4] With its distinctive 2 into 1 'siamese' exhaust system and upgraded camshafts the CSR was a high performance motorcycle but still prone to leaks and vibration.

The factory diverted Chief Engineer Jack Williams from AJS 7R development to address the problems and modify the bikes for racing - with the result that Ron Langston and Don Chapman won the prestigious Thruxton 500 long distance endurance race on the AJS Model 31. Encouraged by this victory in 1963 the AJS Model 31 gained the name Hurricane).[5] By 1966 the company were in financial trouble and production ended.