NORTON ATLAS


Norton Atlas, Norton Dominator, Norton Commando, Norton motorcycles

This 1966 Norton Atlas 750 shows why the model was so successful in it's day. It was a great-looking machine, obviously well-made, with everything 'just-right'. Great handling & loads of power didn't hurt either. It's amazing to consider that this basic engine powered every Norton twin from 1947 until the company's demise in 1977, a 30-year lifespan. It is truly a testament to the excellence of its design.




EVOLUTION OF THE ATLAS
The Norton Atlas evolved from the Norton Dominator line, which had grown since its inception in 1949 from 500 cc to 600cc then again to 650cc with the fire-breathing twin-carb Dominator 650SS. The Norton Atlas was the next logical step.

The venerable Bert Hopwood-designed vertical twin that had started out life as a 500 was now bored out again to yield yet a higher displacement, this time 745cc. The Norton Atlas 750 was born.

FEATHERBED CONTINUES
It was still carried in the wondrous Featherbed Frame, still competitive & more popular than ever after over 10 years on the market. In fact, a burgeoning cottage industry had sprung up dropping other makers' engines in Norton Featherbeds. Norvins (Norton frame, Vincent engine) & Tritons (Triumph engine, Norton frame) sprang up. Why such devotion to a frame? The Featherbed Frame was simply the best handling motorcycle frame in the world, by a large margin. Norton really did the job right to begin with, as far back in 1949 at the Isle of Man TT (which Norton won with a Featherbed Manx), so good in fact that the same basic frame would stay in service until 1966, when it was replaced by the 1967 Norton Commando. In its second generation, all Featherbeds were now of the "Slimline"-design (ie: the top frame tubes were brought closer together to form a narrower backbone.

TOO MUCH IS ALMOST ENOUGH
The Norton Atlas was really intended for & influenced by the lucrative US motorcycle market. Always hungry for more & more power, the American view was "Too much is almost enough" & engineers from Triumph, BSA & Norton scrambled to comply. And the new Atlas certainly filled that role well, with 55hp at 6500 rpm with a single Amal Monobloc 376 carb.

FICKLE MARKET
But more displacement, more power, more speed, even that wasn't enough. It had to look right too. Take the 1959 Triumph Bonneville for example. Fickle American buyers shied away from the new Bonnies because they came clad in the big fenders & headlight nacelle of the Triumph Thunderbird, rather than the stripped-down look of the TR6. Triumph learned quickly that speed alone won't sell an ugly bike. By 1960, the Bonneville looked just like the TR6 & they remained sister-bikes for the rest of their lives.

HIGH STYLE
Norton Motorcycles always had a flair for style anyway. But now they were really building for the export (read that American) market, so they were styled with small 2-1/2 gallon tanks, high handlebars & chrome fenders. They were handsome machines indeed.

VIBRATION BLUES
But Norton was experiencing the same problems that everyone else building vertical twins was: as displacements & power output grew, so did the problem of vibration. Triumph used to fiddle with flywheel weight & crankshaft balance factors constantly in their efforts to deal with their own vibration demons. Norton's answer was to drop compression to 7.6:1. But the vibration would continue, leading to the development of the ultimate solution: Isolastic Suspension.

Much of the running gear was carried over from the Norton Dominator series including the excellent Roadholder front forks & adjustable Girling rear shocks. The Atlas debuted in 1962 with 6-volt electrics, but was upgraded to 12-volt in 1964. Also in 1964, the Atlas grew a second carburetor & wider fork yokes.

RUNNING GEAR
The Norton Atlas 750 was a fast, great handling, very good-looking motorcycle that stacked up well against its contemporaries from Triumph & BSA. Norton Motorcycles in general & the Norton Atlas in particular, always seemed to have a higher-end, more upper-crust (ie: more expensive) image that might have been as much about their inability to compete on price because of their outdated & antiquated manufacturing methods. Either way, they gave us some wonderful machines. And the market today for old Norton Motorcycles has never been stronger.

Norton Atlas, Norton Commando, Norton Dominator, Norton motorcycles

1967 Norton Atlas 750. Last year of Norton Atlas production overlapped start of Norton Commando production.




NORTON ATLAS SPECIALS & HYBRIDS
Norton was part of the AMC (Associated Motor Cycles, Ltd) empire until their collapse in 1966, when they were acquired by Manganese Bronze Holdings (who also owned Villiers). During Norton's AMC years, several models were produced that dropped a Norton Atlas engine in an AMC-derived (read that Matchless-AJS) frame. These were called "Hybrids" because of the obvious cross-pollenization. One example of these hybrids is the Norton P-ll, which used an Atlas 750 engine in a Matchless frame & turned it into an off-road scambler that was much prized then & now.

Norton Atlas, Norton Cafe Racer, Norton Motorcycles, Norton Dominator, Featherbed Frame

This sweet custom cafe racer is built around a 1966 Norton Atlas with Featherbed Frame.


Norton Atlas SPECIFICATIONS:


NORTON ATLAS Production dates............................. 1962-68

Engine:
Type............................................. OHV vertical twin
Displacement................................. 745cc / 45ci
Bore............................................. 73mm / 2.875"
Stroke.......................................... 89mm / 3.503"
Compression Ratio......................... 9:1 (7.6:1 in UK)
Horsepower................................... 55bhp @ 6500 rpm
Valve size, inlet.............................. 38mm / 1.5"
Valve size, exhaust......................... 33mm / 1.312"
Valve Timing:
Inlet Valve Opens........................... 50-degrees BTDC
Inlet Valve Closes........................... 74-degrees ABDC
Exhaust Valve Opens....................... 82-degrees BBDC
Exhaust Valve Closes....................... 42-degrees ATDC

Ignition:
Type:............................................ Alternator & Coil
Ignition Timing.............................. 28-degrees fully advanced

Induction:
Carburetor type............................. Amal Concentric
Bore Size:..................................... 2 X 30mm

Primary:
Engine Sprocket.............................. 26 teeth
Clutch Sprocket............................... 57 teeth
Final Drive Front Sprocket................ 19 teeth
Primary Chain.................................. 0.375" X 0.250" triplex
Clutch Type...................................... Multi-plate, Dry

Gearbox:
Number of Ratios............................. 4
Shift Pattern................................... 1 up, 3 down
Ratios:
1st gear.......................................... 12.40:1
2nd gear......................................... 8.25:1
3rd gear.......................................... 5.90:1
4th gear......................................... 4.84:1

Frame:
Type............................................. Slimline Featherbed
Rear Suspension.............................. Swing Arm
Rear Shocks..................................... Girling
Front Suspension............................. Telescopic
Front Brake..................................... 203mm SLS drum
Rear Brake...................................... 178mm SLS drum
Front Tire........................................ 3.25 X 19"
Rear Tire......................................... 4.25 X 19"

Weight............................................ 185kg / 410lb



Norton Atlas YEAR-BY-YEAR


1966 norton atlas, norton dominator, norton motorcycles

1966 NORTON ATLAS




1967 norton atlas, norton atlas 750, norton motorcycles

1967 NORTON ATLAS 750





This year-by-year breakdown of the Norton Atlas is growing. We're adding content constantly. Thank you for your patience. Please keep checking back, as this site continues to grow into the world's greatest website about Classic British Motorcycles.
Andy






Check out these NORTON BOOKS:



NORTON MOTORCYCLES


NORTON COMMANDO, COMPLETE STORY



NORTON COMMANDO


ESSENTIAL BUYERS GUIDE - NORTON COMMANDO


NORTON COMMANDO: ULTIMATE PORTFOLIO


NORTON MOTORCYCLES FACTORY WORKSHOP MANUAL 1957-70


THE MANX NORTON


THE BOOK OF NORTON DOMINATOR TWINS


NORTON DOMINATOR PERFORMANCE PORTFOLIO


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