1973 Norton Commando

ABOVE: 1973 Norton Commando 750 Roadster was more or less the "standard" Commando.

BACK ON TRACK
After the dismal finish of the 1972 model year, thanks to the Combat engine, 1973 was a good year for Norton Motorcycles. The entire model line had benefited from the engine fixes developed to counter the Combat's tendency to break pistons & eat main bearings. The new Superblend main bearings were now standard on all models. While the Combat engine continued to appear in the catalog briefly, it had been canceled in 1972 because the problems were just too great & Norton's scarce resources needed to be directed into its mainstream line of engines.

MODEL DESIGNATIONS
When the 1973 Norton Commando lineup was announced, the Commando Fastback & Fastback LR had been dropped. The 1973 Norton Commando Roadster, Interstate & Hi-Rider continued on in MkV form, now with optional turn signals, which had only been listed for the first time as an option on the 1972 Norton Commando Interstate. All engines now had the 32mm Amal 932 Concentric carbs & intake tracts from the Combat engine, but with reduced compression ratio & higher gearing. Only the Hi-Rider soldiered on with the old 8-inch TLS front brake, all others now had a single front disk brake on the right & the old drum out back.

ABOVE: The 1973 Norton Commando Interstate was the long-range touring edition.



NEW 850 COMMANDO
The biggest news for the 1973 Norton Commando was the new 850 Commando line. Yes, the ancient 1948 Bert Hopwood design that started life as at 500cc, had one final growth spurt, this time to 829cc, to be called the 850 Commando. This was accomplished by boring the cylinders out to 77mm & retaining the 89mm stroke. The compression ratio was lowered to 8.5:1. Power output was advertised as 60hp at a leisurely 6,200rpm, but was probably more like 53hp, pretty much the same as the 750. The difference was that the 850 got it done with much less stress, at a lower rpm & was thus smoother & more reliable. Prolonged cruising at 5800rpm was possible & this calculated out to about 100mph in top gear. A redesigned cylinder block now had through bolts from head to crankcase as well as short studs & nuts. Flywheel weight was adjusted to compensate for the heavier pistons. An all metal clutch & reinforced gearbox casing were added. A cross-over pipe now joined the two exhaust pipes just downstream from the heads.

750 & 850 ONE YEAR ONLY
The 750 & 850 were both produced throughout most of 1973 & were available in all models. In October 1973, the last 750 rolled off the assembly line. Well, that's not exactly correct. Because a new short-stroke 750 was briefly offered as an option on the John Player Norton & the Commando Roadster. By shortening the stroke to 80.4mm while retaining the 77mm bore from the 850, the new displacement was 749cc (the old 750 was actually 745cc), with a less undersquare engine geometry. This engine was an offshoot from the works experience Norton gained in production racing.

JOHN PLAYER NORTON
The hot new John Player Norton took the Norton Commando Production Racer & did it one better. Its stunning red, white & blue paint scheme & unique classic cafe-style fairing, tank, seat & tail section made this one of the most eye-catching motorcycles of all time. It came standard with low clip-on handlebars & rearset footpegs & foot controls. The fairing had 2 side-by-side headlights flared in, along with standard turn signals.

TROUBLE IN PARADISE
By 1973, Norton Motorcycles looked like the strongest, most viable of the British Motorcycle Manufacturers. Once might BSA & Triumph had sustained huge losses & suffered from horrendous management & were on the verge of collapse. In July 1973, Norton's parent-company, Manganese Bronze Holdings, with help from Britain's Department of Trade & Industry, bought the beleaguered BSA & Triumph and formed a new company called "Norton Villiers Triumph", or NVT. With it came a new plan: Close Triumph's legendary Meriden factory & move all Triumph production into Norton's Wolverhampton plant. When the Triumph workers got wind of this, they immediately took over the Meriden facility & held it for 18 months, halting all Triumph twin production throughout most of 1974 & all of 1975. This on top of all the other problems Norton was facing at the time was simply more than they could handle.


1973 Norton Commando SPECIFICATIONS

Model designations:






Engine type

Displacement 750

Displacement 850

  "  Short-Stroke 750

Bore & Stroke 750

Bore & Stroke 850

B & S Short-Stroke 750

Compression

Carburetors

Ignition

Engine output

Oil system

Oil capacity

Primary drive

Clutch

Gearbox

Ratios, overall:

1st, bottom

2nd

3rd

4th, top

Final drive

Frame type

Suspension, front

Suspension, rear

Brake, front

Brake, rear

Wheelbase

Seat height

Weight

Fastback

Interstate

Roadster

Production Racer

Hi-Rider


Air-cooled OHV parallel twin

746cc / 45 ci

828cc 

749cc

73mm X 89mm / 2.875" X 3.503"

77mm X 89mm / 3.03" X 3.503"

77mm X 80.4mm / 3.03" X 3.17"

8.5:1

2- Amal Concentric, 32mm

Battery & coil, Lucas

60 bhp @ 6200 rpm

Dry sump

6 pts

Triplex chain

Multi-plate diaphragm, wet

4-speed constant-mesh, right-foot shift


12.40:1

8.25:1

5.90:1

4.84:1

Chain

Welded double cradle, Isolastic Suspension

Telescopic fork, hydraulic damping

Swing Arm, 2 dampers, Isolastic mounts

10" disk, 2-piston hydraulic caliper

7" SLS drum, full width

57.1"

31.3"

430 lbs


A WORK IN PROGRESS
In our efforts to complete our online index, and make this the world's greatest website about classic British motorcycles, we're building pages as fast as we can. The first thing we add are the pictures. Then come the specifications and then the history. So, if you see a page that just has only pictures on it, or just pictures and specs, please check back in a few weeks to see if we have it done. Thanks for your patience. And thanks for visiting Classic-British-Motorcycles.com. Please tell your friends about us.



MORE NORTON PAGES:
Norton Motorcycles
.....Norton Manx
..........1948
..........1949
..........1952
..........1953
..........1952
..........1957
..........1959
..........1962
.....Norton Dominator
..........1957
..........1959
.....Norton Atlas
..........1966
..........1967
.....Norton Commando
..........1968
..........1969
..........1970
..........1971
..........1972
..........1973
..........1974
..........1975
.....Interview with a Norton Expert


Check out these NORTON BOOKS

NORTON COMMANDO: THE COMPLETE STORY


THE UNAPPROACHABLE NORTON


NORTON COMMANDO: ESSENTIAL BUYERS GUIDE


ILLUSTRATED HISTORY OF NORTON MOTORCYCLES, by Roy Bacon


NORTON COMMANDO SHOP MANUAL, Haynes


NORTON COMMANDO: ULTIMATE PORTFOLIO


NORTON FACTORY WORKSHOP MANUAL, 1957-1970


NORTON


ILLUSTRATED MOTORCYCLE LEGENDS: NORTON by Roy Bacon


NORTON 500, 600, 650 & 750 TWINS WORKSHOP MANUAL, Haynes


NORTON MOTORCYCLES FROM 1950-1986


NORTON DOMINATOR PERFORMANCE PORTFOLIO 1949-1970


ILLUSTRATED NORTON BUYERS GUIDE, by Roy Bacon


NORTON, COMPLETE ILLUSTRATED HISTORY


NORTON DOMINATOR


NORTON TWIN RESTORATION, by Roy Bacon


THE NORTON STORY


NORTON COMMANDO


NORTON FACTORY REPAIR HANDBOOK, 750 & 850 COMMANDO


NORTON ROTARIES


BOOK OF THE NORTON 1938-1956


BOOK OF THE NORTON DOMINATOR


MANX NORTON


NORTON: A HISTORY


BOOK OF THE NORTON OHV SINGLES, 1955-1963


NORTON: THE COMPLETE HISTORY


MANX NORTON SUPER PROFILE


NORTON SINGLES 1927-1966, by Roy Bacon


BOOK OF NORTON, ILLUSTRATED SHOP MANUAL 1932-1939, by Clymer


NORTON- THE RACING STORY


DOMINATOR IN THE SHADOWS


NORTON TWINS, by Roy Bacon


NORTON TWINS REPAIR MANUAL, Haynes


NORTON ROTARIES MOTOR CYCLES


THE MANX NORTON






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