norton atlas 750 specifications
Initially having a nominal 750 cc displacement, actually 745 cc (45.5 cu in), in 1973 it became an 850 cc, actually 828 cc (50.5 cu in).It had a hemi-type head, similar to all OHV Norton engines since the early 1920s.
However, the British motorcycle economy was going from bad to worse, and in 1966 AMC was merged with the BSA/Triumph group. The crankcases of all the 650s were changed too, with a bulge @ the rear to accommodate the larger stroke crankshaft & big-end assembly, because from the 596 cc engine only had a stroke of 82 mm whereas the 650 engine had as is rightly stated, the 89 mm stroke, so 88, 99 Dominator , crankcases cannot be used on the larger than 596 cc engines. Also for: Es2, 88, 99, 650, Sports specials, 750 atlas, 750 scrambler. 50 motorcycle pdf manual download.
At Berliner’s urging a year later the factory saw fit to bolt a pair of 30mm Monoblocs on the cylinder head. It was a good bike, so long as the rider stayed under 5,000 rpm.Norton twin camshaft drives were never by gears, always chains.
The Mark 1 Atlas was launched as the 750SS in the early 1960s, but by the time it appeared c. 1962 it was being called a 750cc Atlas, with Norton's famous The styling was aimed at the US market with high-rise handlebars, small 2.5-gallon petrol tank and valanced chrome mudguards and chain guard. Segment: Naked / Road The 1963 Norton Atlas evolved from the Norton Dominator line, which had grown since its … The 1967 Norton Atlas and all other motorcycles made 1894-2020. Pictures. Specifications. The bar was slightly raised, as Americans preferred those to the flat bar that was found on the Manxman.At Berliner’s urging a year later the factory saw fit to bolt a pair of 30mm Monoblocs on the cylinder head. This particular design put the single camshaft up forward of the cylinders, spun by a chain driven via the right-side timing case; later the chain would be replaced by gears.Here we will take a moment to look at enlargement technology. Then came the 750 Atlas, based directly on the 650, with the bore enlarged to 73mm and the stroke retaining its 89mm. 1967 Norton Atlas Claimed power: 49hp @ 6,800rpm Top speed: 110mph Engine: 745cc air-cooled OHV parallel twin, 73mm x 89mm bore and stroke, 7.6:1 compression ratio Weight (dry): 395lb (180kg) Fuel capacity: 3.2gal (12ltr)
The Atlas model continued to be built until the stock of parts was depleted.
These had designations G15 or N15 for the roadster and P11 for the trailster (instead of names).
This meant the Atlas would have to soldier on until the new design was ready.Berliner’s American operation was selling lots of these Atlas models. The Roadholder fork was suitably famous, though the Girling shocks at back were on the common side. “Give me a bigger engine, a nice 45 cubic inches,” he told the marketing types in Birmingham, England. Any café racer type could buy a 650 Manxman, with twin carbs, a tachometer and low bars, but real American men wanted the Atlas.The company founded by James L. Norton had come a long way in 60 years. “We don’t need no stinkin’ tach, ’cause my boys want midrange power, none of this redline nonsense.” In his ads Berliner liked to refer to this as the High Torque engine, and in truth it was a pretty good stump puller.I can imagine Edward Turner, originator of the ubiquitous British vertical twin, hearing about the new Norton 750 and muttering from his office over at BSA, “I told you so.” That would refer to Turner’s infamous dictum uttered back in the early 1950s, that a parallel twin should never exceed 650cc and 6,500 rpm, otherwise the vibration would be disastrous.Remember, those were pushrod days, well before anybody had thought much about overhead camshafts and internal balancers. Discussions. NORTON ATLAS 750 (1963 - 1969) Updated: 6 May 2019. Norton raced a 500cc twin on the Isle of Man, it still remains the only 500cc pushrod engine twin to lap at over 100mph (just) with the late Tom Phillis in I believe 1961, it is all in the record books.The 650 cc Manxman had high bars in the American market! When Berliner gave test bikes to the magazines, he “estimated” the Atlas horsepower to be around 56, while he advertised the 650 Manxman as having 52 at 6,800 rpm.
Back in 1952 it had become part of Associated Motor Cycles, which produced the Matchless and AJS marques, but the entities remained entirely separate. View and Download Norton 50 maintenance manual and instruction book online. The Featherbed was really two complete tubular loops with four cross pieces providing suitable rigidity and joined at the steering head.
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