Norton Interpol specs. 1969- on
Bikes
Norton Interpol 1969-76
Specifications
Twin cylinder inclined four-stroke OHV engine
Alloy Head with cast-iron barrels
Bore 750cc 73mm, 850cc 77mm
Stroke 89mm
Twin Carbs - Amal Concentric 530 or 532
Compression ratio:
Standard 750cc - 9:1 producing 60 Bhp @ 6800 rpm
Standard 850cc - 8.5:1 producing 60 Bhp @ 5900 rpm
750cc Combat - 10:1 producing 65 Bhp @ 6500 rpm
Top speed around 115 MPH (depending on model)
Brakes:
Front - 8" tls replaced by 10.7" hydraulic disc
Rear - 7" single leading shoe
Wheels and Tyres - 4.10 x 19 inch, all models
Isolastic suspension with 'Roadholder' forks
12v electrics, alternator and rectifier, positive earth.
Electric start on later models
1972 Norton Interpol 750cc ex-Lancashire
As the police version of the Atlas was soon to be discontinued, development of the Interpol was untertaken, rather reluctantly. Norton production and sales were focused on the export market, especilly to the USA, following the introduction of the Commando. Sales of police vehicles had previously been low, but once Neale Shilton joined the company he was able to use his expertise as former Triumph Police Sales manager, to produce a prototype machine that the management finally agreed to put into production.
The prototype was shown at the Brighton motorcycle show in 1969, further developed and demonstrated to police forces across the country and abroad to Neales former clients. Deliveries began in April 1971. Production ceased in 1977.
Pictures and detailed changes through the years
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Testing the two-tone horns