1975 NORTON COMMANDO


Norton Commando, Norton motorcycles, Norton 850 commando

1975 Norton Commando Roadster.




TROUBLE BEHIND THE SCENES
While the Norton Commando was enjoying reasonable success in the marketplace, other problems, both inside & outside the company wreaked havoc with Norton Motorcycles finances. By 1975, the Meriden Triumph fiasco was dying down finally, but the worker-takeover of the plant had curtailed Triumph twin production for 18 months, hurting the bottom line, since Norton now owned Triumph Motorcycles & BSA Motorcycles. What's worse, the solution to the strike was for Norton-Villiers-Triumph (NVT) to cut Triumph loose, allowing its workers to form their own Meriden Co-operative. Of course BSA hadn't built a bike since 1972. What must have seemed like a coup when Manganese Bronze Holdings (who owned Norton & AMC) scooped up Triumph & BSA, suddenly turned into one big money-losing dud. On top of all this, the British economy at the time was experiencing massive inflation & an energy crisis that drove Norton's costs up to the point where profits were very slim at best.

NARROWER PRODUCT LINE
The result was a drastically cut-back product line. Gone were the John Player Norton & the hideous Hi-Rider. This allowed Norton to concentrate all of their dwindling resources on the 2 models that made up the core of their business: the 1975 Norton Commando Roadster & the 1975 Norton Commando Interstate, now both designated Mk III. The police-only 1975 Norton Commando Interpol was also produced & received the same upgrades as the other two models.

Norton Commando engine, Norton Commando, Norton motorcycles A CRIME AGAINST NATURE
After over 70 years of shifting on the right, Norton was forced to face a critical decision: Either switch the 1975 Norton Commando over to a left-foot-shift, or cease selling motorcycles in the U.S., by far it's richest market. The Brits had practically invented foot shifting. The basic British layout (ie: timing side & gearbox on right, primary & clutch on left) had been ordained by God at the creation of the Universe. And it wasn't arbitrary. Shifting with the left foot came in very handy in racing, which was mostly left-turns. So, this was a major change, both psychologically & mechanically. Triumph, the only other British motorcycle company still standing by 1975, was going through the same thing on both the Triumph Bonneville & the Triumph Trident T160.

NUMEROUS CHANGES
The changes needed to accomplish this were quite extensive. Of course, the shifter had to be moved from the right gearbox cover to the center of the primary cover. This was accomplished by solidly mounting the gearbox to the crankcase for the first time (using conventional tensioners to adjust the primary chain) & extending a shaft from the gearbox through the inner & outer primary chaincases.

This meant the brake pedal had to be moved to the right side & rather than re-engineer the rear drum brake setup, they upgraded it to a hydraulic rear disk brake (on the right). These changes required numerous modifications to the engine, frame & running gear. These included moving the front disk brake from the right side (as it had been on the rear drum brake bikes) to the left, for some obscure reason related to the handling.

In addition, a new vernier adjustment system replaced the shims as a means to adjust out the play in the Isolastic Suspension bushings. This system was part of the original design, but ruled out early on in the interest of cost-cutting. It was now re-introduced. What's more, it could be retrofitted to any earlier Norton Commando.



ELECTRIC STARTER, FINALLY!
A full decade after Honda started building big twins (Honda 450 DOHC) with electric starters, Norton Motorcycles finally introduced an electric starter for the 1975 Norton Commando. It was bolted to the inner primary case. Both inner & outer cases were new & were now fastened with several screws (like most bikes) rather than the time-honored single nut in the middle. It drove the left end of the crankshaft via a gear train & roller clutch.

NOT AS GOOD AS HOPED
The new starter was never a great success, working only intermittently, often too weak to turn the engine over fast enough to start it. Owners were glad that the kickstarter had been retained.

DETAIL CHANGES
The two basic models, the Roadster & Interstate, were mechanically identical & differed only in seat, side covers & fuel tank. By this time, Norton Motorcycles was streamlining & cutting costs wherever possible. They were now only painting the tanks & side covers, leaving the fenders polished. This also made color changes much easier to accomplish. The Interpol had its own unique tank, seat, valanced fenders (mudguards)& handlebars.

THE END IS NEAR
The Norton Commando had evolved just about as far as it could, given its 30-year-old engine design. As good as it was, it wasn't nearly good enough to counter the incredible motorcycles being built by Honda, Yamaha, Suzuki & Kawasaki, on the racetrack or in the showroom. Antiquated manufacturing methods & a crippling British economy strapped Norton with high costs that never allowed it to clear a profit. How long could it go on like this?

1976, 1977 & 1978 NORTON COMMANDOS
As it turned out, about 2 more years. Limited production of the 1976 Norton Commando Roadster & the Commando Interstate continued in 1976 & was pretty much all carryover from 1975. A final production run of 1500 machines was built in 1977. By this time, Norton Motorcycles was in receivership. In 1978, a final batch of 30 Norton Commandos was built out of the parts that remained in the factory, now under the control of the courts. For all intents & purposes, 1977 was the last true model year for the Norton Commando & for Norton Motorcycles in general, at least insofar as OHV twin production goes...for the time being, anyway...


1975 Norton Commando SPECIFICATIONS:


1975 NORTON COMMANDO
Model Designations:
Roadster Mk III
Interstate Mk III
Original List Prices (approx):......................................$1,995
Engine:
Type......................................................................OHV parallel twin
Dislplacement (actual):........................................... 746cc
Bore..................................................................... 73mm / 2.875"
Stroke................................................................... 89mm / 3.503
Compression Ratio:................................................. 9:0:1
Horsepower: ........................................................ 58hp @ 6500rpm
Carburetors ...........................................................(2) 30mm Amal Concentrics
Ignition..................................................................(2) coils
Oil System..............................................................dry sump
Oil Capacity.............................................................6pt.
Lighting System.......................................................12V battery & alternator
Ignition Timing, fully advanced...................................28-degrees BTDC
Primary drive...........................................................triplex chain
Clutch Type............................................................. multi-plate diaphram
Gearbox Ratios:
1st Gear...................................................................12.40:1
2nd Gear................................................................. 8.25:1
3rd Gear.................................................................. 5.90:1
4th Gear.................................................................. 4.84:1
Top Speeds in Gears @ 7000rpm:
1st Gear................................................................... 43.2mph
2nd Gear ................................................................. 64.8mph
3rd Gear ................................................................. 90.6mph
4th Gear ................................................................. 110.4mph
Front Tire................................................................4.10 X 19
Rear Tire.................................................................4.10 X 19
Dimensions:
Wheelbase................................................................ 57.1 inches
Seat Height............................................................... 31.3 inches
Curb Weight.............................................................. 419lb.


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


Norton Commando
Norton Motorcycles

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