The Norton Motorcycle Company (formerly Norton Motors, Ltd.) is an English motorcycle marque, originally from Birmingham, England, UK. It was founded in 1898 as a manufacturer of "fittings and parts for the two-wheel trade".[1] By 1902 the company had begun manufacturing motorcycles with bought-in engines. In 1908 a Norton-built engine was added to the range. This began a long series of production of single and eventually twin-cylinder motorcycles, and a long history of racing involvement.
Production of the military Model 16 H and Big 4 sidevalve motorcycles was Norton's contribution to the WWII war effort, almost 100,000 being manufactured.
When major shareholders started to leave Norton in 1953 the company declined and Associated Motor Cycles bought the shares.[2] Although motorcycle sales went through a recession in the 1950s, and Norton Motors Ltd was only a small manufacturer, Norton sales flourished. A series of Norton Dominator Twins of 500 cc, then 600 cc, then 650 cc and then the 750 cc Norton Atlas kept sales buoyant, especially with sales to the United States.
In 1968 the new 750 cc Norton Commando Model appeared, with the engine/gearbox/swingarm unit isolastically insulated from the frame with a series of rubber mountings. This kept the vibrations from the rider, giving a smooth comfortable ride. The Commando was a best seller, and voted #1 Motorcycle of the Year a number of times in Britain. 850 cc models appeared for 1973, giving more torque. For 1975 an electric start arrived in the 850 Mk3.
The largest UK motorcycle manufacturer at the time was BSA-Triumph, comprising Birmingham Small Arms Company in Birmingham, and Triumph Motorcycles in Meriden. BSA-Triumph faced difficulties caused by poor management, outdated union practices, old-fashioned motorcycle designs and antiquated factory conditions. A merger with Norton Motorcycles was proposed; but although Dennis Poore's Norton Motorcycles was by far the smaller partner, Poore effectively secured a take-over of BSA-Triumph, forming Norton Villiers Triumph (NVT). The Triumph factory Meriden was the least modern; but workers engaged in a "sit-in", forming a workers' co-operative. Poore was CEO of Manganese Bronze Holdings, a company apparently more concerned with asset stripping than with motorcycle production. Subsequent political manoeuvrings led to the downfall of NVT, as taxpayer-assisted wranglings over amalgamations and sell-offs all but killed the once extensive UK motorcycle industry.
In late 2008, Stuart Garner, a UK businessman, bought the rights to Norton from some US concerns and relaunched Norton in its Midlands home at Donington Park where it will develop the 961cc Norton Commando and a new range of Norton motorcycles.[3]
On 29 January 2020, it was announced that the company had gone into administration because £300,000 outstanding in unpaid taxes was due to HM Revenue and Customs from an original amount of £600,000.[4][5] Administrators BDO were appointed by Metro Bank, with company representatives stating that £135,000 in "outstanding research and development tax relief" was overdue, and would substantially reduce the amount owed. The court case was adjourned until mid-February.[6][5]
The original company was formed by James Lansdowne Norton (known as "Pa") at 320, Bradford Street, Birmingham, in 1898.[1] In 1902 Norton began building motorcycles with French and Swiss engines. In 1907 a Norton ridden by Rem Fowler won the twin-cylinder class in the first Isle of Man TT race, beginning a sporting tradition that went on until the 1960s. The first Norton engines were made in 1907, with production models available from 1908. These were the 3.5 hp (490 cc) and the 'Big 4' (633cc), beginning a line of side-valve single-cylinder engines which continued with few changes until the late 1950s.[2]
The first Norton logo was a fairly simple, art nouveau design, with the name spelled in capitals.[7] However, a new logo appeared on the front of the catalogue for 1914, which was a joint effort by James Norton and his daughter Ethel. It became known as the "curly N" logo, with only the initial letter as a capital, and was used by the company thereafter, first appearing on actual motorcycles in 1915.[8] Ethel Norton also did some testing of her father's motorcycles.[citation needed]
In 1913 the business declined, and R. T. Shelley & Co., the main creditors, intervened and saved it. Norton Motors Ltd was formed shortly afterwards under joint directorship of James Norton and Bob Shelley. Shelley's brother-in-law was tuner Dan O'Donovan, and he managed to set a significant number of records on the Norton by 1914 when the war broke out - and as competition motorcycling was largely suspended during the hosilities, these records still stood when production restarted after the war.[9] 1914 Dan O'Donovan records set in April 1914 :
Under 500 cc flying km 81.06 mph, flying mile 78.60 mph - 490 cc Norton
Under 750 cc flying km and flying mile see above
Under 500 cc with sidecar flying km 65.65 mph, flying mile 62.07 mph - 490 cc Norton
Under 750 cc with sidecar flying km and flying mile see above
On 17 July 1914 O'Donovan also took the flying 5 mile record at 75.88 mph, and the standing start 10 mile record at 73.29 mph, again on the 490 cc Norton.
First World War
Norton continued production of their 3.5 hp and Big 4 singles well into the war period, though in November 1916 the Ministry of Munitions issued an order that no further work on motor cycles or cars would be allowed from 15 November 1916 without a permit.[10] By this time most motor cycle companies were already either producing munitions (or aircraft parts), or devoted to the export trade. Norton were involved in exporting and earlier that year had announced[11] a new 'Colonial Model' of their 633cc Big 4. This featured an increase in ground clearance from 4.25" to 6.5", by altering the frame, larger tank, greater clearance on mudguards, and a sturdy rear carrier. The engine was unaltered, and transmission was via a Sturmey-Archer 3-speed gearbox.
In February 1918, Motor Cycle reported[12] on a visit to Norton Motors. Mr Norton had stated that he expected three post-war models, the 3.5 hp 490 cc TT with belt drive (for the 'speed merchant'), and two utility mounts, one with detuned TT engine, and the other being the Big Four for very heavy solo or sidecar work, both of these with three-speed Sturmey-Archer countershaft gearbox and all chain drive. It was also stated that he had been experimenting with aluminium pistons, and that Norton had produced a book of driving hints which also contained details of their Military and Empire models.
In May 1918, Norton stated in one of their adverts[13] that 'The ministry are taking the whole of our present output, but we have a waiting list' - this advert also uses the "Unapproachable Norton" phrase. Few Norton WD models appear in the For Sale column of The Motor Cycle after the war, suggesting they were shipped abroad, apparently one order going to the Russian Army [1]. The 1913–1917 Red Book[14] listing UK Motor, Marine and Aircraft production shows Norton dropped from a full range in 1916, to only the Military Big Four in 1917.
Inter-War years
Norton resumed deliveries of civilian motorcycles in April 1919 with models aimed at motorcyclists who enjoyed the reliability and performance offered by long-stroke single-cylinder engines with separate gearboxes.
Norton also resumed racing and in 1924 the Isle of Man Senior TT was the first win with a race average speed over 60 mph, rider Alec Bennett. Norton won this event ten times until they withdrew from racing in 1938.
J.L. Norton died in 1925 aged only 56, but he saw his motorcycles win the Senior and sidecar TTs in 1924,[15] specifically with the 500 cc Model 18, Norton's first overhead valve single.[16]
Designed by Walter Moore, the Norton CS1 engine appeared in 1927, based closely on the ES2 pushrod engine and using many of its parts. Moore was hired away to NSU in 1930, after which Arthur Carroll designed an entirely new OHC engine destined to become the basis for all later OHC and DOHC Norton singles. (Moore's move to NSU prompted his former staff to quip NSU stood for "Norton Spares Used") The Norton racing legend began in the 1930s. Of the nine Isle of Man Senior TTs (500 cc) between 1931 and 1939, Norton won seven.[17]
Until 1934 Norton bought Sturmey-Archer gearboxes and clutches. When Sturmey discontinued production Norton bought the design rights and had them made by Burman, a manufacturer of proprietary gearboxes.
Norton started making military motorcycles again in 1936 after a tender process in 1935 where a modified Norton 16H beat contenders. From 900 in 1936 to 2000 in 1937, Norton was ahead of the competition as war loomed, and there was good reason in terms of spares and maintenance for the military to keep to the same model. Between 1937 and 1945 nearly a quarter (over 100,000) of all British military motorcycles were Nortons, basically the WD 16H (solo) and WD Big Four outfit with driven sidecar wheel.[2]
Post-war
The Isle of Man Senior TT successes continued after the war, with Nortons winning every year from 1947 to 1954.
After the Second World War, Norton reverted to civilian motorcycle production, gradually increasing its range. A major addition in 1949 was the twin cylinder Model 7, known as the Norton Dominator, a pushrod 500 cc twin-cylinder machine designed by Bert Hopwood. Its chassis was derived from the ES2 single, with telescopic front and plunger rear suspension, and an updated version of the gearbox known as the "lay-down" box. More shapely mudguards and tanks completed the more modern styling to Nortons new premium model twin.
Norton struggled to reclaim its pre-WWII racing dominance as the single-cylinder machine faced fierce competition from the multi-cylinder Italian machines and AJS from the UK. In the 1949 Grand Prix motorcycle racing season, the first year of the world championship, Norton made only fifth place and AJS won. That was before the Featherbed frame appeared, developed for Norton by the McCandless brothers of Belfast in January 1950, used in the legendary Manx Norton and raced by riders including Geoff Duke, John Surtees and Derek Minter. Very quickly the featherbed frame, a design that allowed the construction of a motorcycle with good mass-stiffness distribution,[18] became a benchmark by which all other frames were judged.[17]
Norton also experimented with engine placement, and discovered that moving the engine slightly up/down, forward/back, or even right/left, could deliver a "sweet spot" in terms of handling. Motorcycle designers still use this method to fine-tune motorcycle handling.[19]
In 1951 the Norton Dominator was made available to export markets as the Model 88 with the Featherbed frame. Later, as production of this frame increased, it became a regular production model, and was made in variants for other models, including the OHV single-cylinder machines.
Manx Nortons also played a significant role in the development of post war car racing. At the end of 1950, the English national 500 cc regulations were adopted as the new Formula 3. The JAP Speedway engine had dominated the category initially but the Manx was capable of producing significantly more power and became the engine of choice. Many complete motorcycles were bought in order to strip the engine for 500 cc car racing, as Norton would not sell separate engines.
The racing successes were transferred to the street through cafe racers, some of which would use the featherbed frame with an engine from another manufacturer to make a hybrid machine with the best of both worlds. The most famous of these were Tritons - Triumph twin engines in a Norton featherbed frame.
Despite, or perhaps because of, the racing successes Norton was in financial difficulty. Reynolds could not make many of the highly desired Featherbed frames and customers lost interest in buying machines with the older frames. In 1953 Norton sold out to Associated Motorcycles (AMC), who owned the brands AJS, Matchless, Francis-Barnett and James. In 1962 the Norton factory in Bracebridge Street, Birmingham was closed and production was moved to AMC's Woolwich factory in south-east London.
Under AMC ownership a much improved version of the Norton gearbox was developed, to be used on all the larger models of AJS, Matchless and Norton. Again, the major changes were for improved gear selection. In September 1955 a 600 cc Dominator 99 was launched. The 1946 to 1953 Long Stroke Manx Norton was 79.6 mm × 100 mm (3.1 in × 3.9 in) initially SOHC, the DOHC engine becoming available to favoured racers in 1949. The Short Stroke model (1953 to 1962) had bore and stroke of 86 mm × 85.6 mm (3.4 in × 3.4 in). It used a dry sump 499 cc single-cylinder motor, with two valves operated by bevel drive, shaft driven twin overhead camshafts. Compression ratio was 11:1. It had an Amal GP carburettor, and a Lucas racing magneto. The 1962 500 cc Manx Nortons produced 50 bhp (37 kW) at 6,780rpm, weighed 142 kg (313 lb), and had a top speed of 209 km/h (130 mph).
In 1960, a new version of the road-going Featherbed frame was developed in which the upper frame rails were bent inwards to reduce the width between the rider's knees for greater comfort. The move was also to accommodate the shorter rider as the wide frame made it difficult to reach the ground. This frame is known as the "slimline" frame; the earlier frames then became known as the "wideline".
The last Manx Nortons were sold in 1963. Even though Norton had pulled out of Grand Prix racing in 1954, the race-shop at Bracebridge Street continued until 1962, and the Manx became a mainstay of privateer racing, and even today are highly sought after, commanding high prices.
On 7 November 1960 the first new 650 cc Norton Manxman was launched for the American market only. By September 1961 the Norton 650SS appeared for the UK market, the 750 cc (Atlas). By 20 April 1962 for the American market as they demanded more power,[clarification needed] but the increases to the vertical twin engine's capacity caused a vibration problem at 5500 rpm. A 500 cc vertical twin is smoother than a single-cylinder, but if the vertical twin's capacity is enlarged vibration increases. The 750 Norton Atlas proved too expensive and costs could not be reduced. Financial problems gathered.[20]
There was an export bike primarily for use as a desert racer, sold up until 1969 as the Norton P11,[21] AJS Model 33, Matchless G15 and Norton N15 which used the Norton Atlas engine in a modified Matchless G85CS scrambler frame with Norton wheels and front forks. This bike was reputed to vibrate less than the Featherbed frame model. AMC singles were also sold with Norton badging in this era.[22]
Also during this period Norton developed a family of three similar smaller-capacity twin cylinder machines: first the Norton Jubilee 250 and then the Navigator 350 and the Electra 400, which had an electric starter. These models were Norton's first use of unit construction. The engine was an entirely new design by Bert Hopwood and the frame and running gear were from the Francis-Barnett range, also owned by AMC. These machines had a reputation for poor reliability.
Production of the military Model 16 H and Big 4 sidevalve motorcycles was Norton's contribution to the WWII war effort, almost 100,000 being manufactured.
When major shareholders started to leave Norton in 1953 the company declined and Associated Motor Cycles bought the shares.[2] Although motorcycle sales went through a recession in the 1950s, and Norton Motors Ltd was only a small manufacturer, Norton sales flourished. A series of Norton Dominator Twins of 500 cc, then 600 cc, then 650 cc and then the 750 cc Norton Atlas kept sales buoyant, especially with sales to the United States.
In 1968 the new 750 cc Norton Commando Model appeared, with the engine/gearbox/swingarm unit isolastically insulated from the frame with a series of rubber mountings. This kept the vibrations from the rider, giving a smooth comfortable ride. The Commando was a best seller, and voted #1 Motorcycle of the Year a number of times in Britain. 850 cc models appeared for 1973, giving more torque. For 1975 an electric start arrived in the 850 Mk3.
The largest UK motorcycle manufacturer at the time was BSA-Triumph, comprising Birmingham Small Arms Company in Birmingham, and Triumph Motorcycles in Meriden. BSA-Triumph faced difficulties caused by poor management, outdated union practices, old-fashioned motorcycle designs and antiquated factory conditions. A merger with Norton Motorcycles was proposed; but although Dennis Poore's Norton Motorcycles was by far the smaller partner, Poore effectively secured a take-over of BSA-Triumph, forming Norton Villiers Triumph (NVT). The Triumph factory Meriden was the least modern; but workers engaged in a "sit-in", forming a workers' co-operative. Poore was CEO of Manganese Bronze Holdings, a company apparently more concerned with asset stripping than with motorcycle production. Subsequent political manoeuvrings led to the downfall of NVT, as taxpayer-assisted wranglings over amalgamations and sell-offs all but killed the once extensive UK motorcycle industry.
In late 2008, Stuart Garner, a UK businessman, bought the rights to Norton from some US concerns and relaunched Norton in its Midlands home at Donington Park where it will develop the 961cc Norton Commando and a new range of Norton motorcycles.[3]
On 29 January 2020, it was announced that the company had gone into administration because £300,000 outstanding in unpaid taxes was due to HM Revenue and Customs from an original amount of £600,000.[4][5] Administrators BDO were appointed by Metro Bank, with company representatives stating that £135,000 in "outstanding research and development tax relief" was overdue, and would substantially reduce the amount owed. The court case was adjourned until mid-February.[6][5]
The original company was formed by James Lansdowne Norton (known as "Pa") at 320, Bradford Street, Birmingham, in 1898.[1] In 1902 Norton began building motorcycles with French and Swiss engines. In 1907 a Norton ridden by Rem Fowler won the twin-cylinder class in the first Isle of Man TT race, beginning a sporting tradition that went on until the 1960s. The first Norton engines were made in 1907, with production models available from 1908. These were the 3.5 hp (490 cc) and the 'Big 4' (633cc), beginning a line of side-valve single-cylinder engines which continued with few changes until the late 1950s.[2]
The first Norton logo was a fairly simple, art nouveau design, with the name spelled in capitals.[7] However, a new logo appeared on the front of the catalogue for 1914, which was a joint effort by James Norton and his daughter Ethel. It became known as the "curly N" logo, with only the initial letter as a capital, and was used by the company thereafter, first appearing on actual motorcycles in 1915.[8] Ethel Norton also did some testing of her father's motorcycles.[citation needed]
In 1913 the business declined, and R. T. Shelley & Co., the main creditors, intervened and saved it. Norton Motors Ltd was formed shortly afterwards under joint directorship of James Norton and Bob Shelley. Shelley's brother-in-law was tuner Dan O'Donovan, and he managed to set a significant number of records on the Norton by 1914 when the war broke out - and as competition motorcycling was largely suspended during the hosilities, these records still stood when production restarted after the war.[9] 1914 Dan O'Donovan records set in April 1914 :
Under 500 cc flying km 81.06 mph, flying mile 78.60 mph - 490 cc Norton
Under 750 cc flying km and flying mile see above
Under 500 cc with sidecar flying km 65.65 mph, flying mile 62.07 mph - 490 cc Norton
Under 750 cc with sidecar flying km and flying mile see above
On 17 July 1914 O'Donovan also took the flying 5 mile record at 75.88 mph, and the standing start 10 mile record at 73.29 mph, again on the 490 cc Norton.
First World War
Norton continued production of their 3.5 hp and Big 4 singles well into the war period, though in November 1916 the Ministry of Munitions issued an order that no further work on motor cycles or cars would be allowed from 15 November 1916 without a permit.[10] By this time most motor cycle companies were already either producing munitions (or aircraft parts), or devoted to the export trade. Norton were involved in exporting and earlier that year had announced[11] a new 'Colonial Model' of their 633cc Big 4. This featured an increase in ground clearance from 4.25" to 6.5", by altering the frame, larger tank, greater clearance on mudguards, and a sturdy rear carrier. The engine was unaltered, and transmission was via a Sturmey-Archer 3-speed gearbox.
In February 1918, Motor Cycle reported[12] on a visit to Norton Motors. Mr Norton had stated that he expected three post-war models, the 3.5 hp 490 cc TT with belt drive (for the 'speed merchant'), and two utility mounts, one with detuned TT engine, and the other being the Big Four for very heavy solo or sidecar work, both of these with three-speed Sturmey-Archer countershaft gearbox and all chain drive. It was also stated that he had been experimenting with aluminium pistons, and that Norton had produced a book of driving hints which also contained details of their Military and Empire models.
In May 1918, Norton stated in one of their adverts[13] that 'The ministry are taking the whole of our present output, but we have a waiting list' - this advert also uses the "Unapproachable Norton" phrase. Few Norton WD models appear in the For Sale column of The Motor Cycle after the war, suggesting they were shipped abroad, apparently one order going to the Russian Army [1]. The 1913–1917 Red Book[14] listing UK Motor, Marine and Aircraft production shows Norton dropped from a full range in 1916, to only the Military Big Four in 1917.
Inter-War years
Norton resumed deliveries of civilian motorcycles in April 1919 with models aimed at motorcyclists who enjoyed the reliability and performance offered by long-stroke single-cylinder engines with separate gearboxes.
Norton also resumed racing and in 1924 the Isle of Man Senior TT was the first win with a race average speed over 60 mph, rider Alec Bennett. Norton won this event ten times until they withdrew from racing in 1938.
J.L. Norton died in 1925 aged only 56, but he saw his motorcycles win the Senior and sidecar TTs in 1924,[15] specifically with the 500 cc Model 18, Norton's first overhead valve single.[16]
Designed by Walter Moore, the Norton CS1 engine appeared in 1927, based closely on the ES2 pushrod engine and using many of its parts. Moore was hired away to NSU in 1930, after which Arthur Carroll designed an entirely new OHC engine destined to become the basis for all later OHC and DOHC Norton singles. (Moore's move to NSU prompted his former staff to quip NSU stood for "Norton Spares Used") The Norton racing legend began in the 1930s. Of the nine Isle of Man Senior TTs (500 cc) between 1931 and 1939, Norton won seven.[17]
Until 1934 Norton bought Sturmey-Archer gearboxes and clutches. When Sturmey discontinued production Norton bought the design rights and had them made by Burman, a manufacturer of proprietary gearboxes.
Norton started making military motorcycles again in 1936 after a tender process in 1935 where a modified Norton 16H beat contenders. From 900 in 1936 to 2000 in 1937, Norton was ahead of the competition as war loomed, and there was good reason in terms of spares and maintenance for the military to keep to the same model. Between 1937 and 1945 nearly a quarter (over 100,000) of all British military motorcycles were Nortons, basically the WD 16H (solo) and WD Big Four outfit with driven sidecar wheel.[2]
Post-war
The Isle of Man Senior TT successes continued after the war, with Nortons winning every year from 1947 to 1954.
After the Second World War, Norton reverted to civilian motorcycle production, gradually increasing its range. A major addition in 1949 was the twin cylinder Model 7, known as the Norton Dominator, a pushrod 500 cc twin-cylinder machine designed by Bert Hopwood. Its chassis was derived from the ES2 single, with telescopic front and plunger rear suspension, and an updated version of the gearbox known as the "lay-down" box. More shapely mudguards and tanks completed the more modern styling to Nortons new premium model twin.
Norton struggled to reclaim its pre-WWII racing dominance as the single-cylinder machine faced fierce competition from the multi-cylinder Italian machines and AJS from the UK. In the 1949 Grand Prix motorcycle racing season, the first year of the world championship, Norton made only fifth place and AJS won. That was before the Featherbed frame appeared, developed for Norton by the McCandless brothers of Belfast in January 1950, used in the legendary Manx Norton and raced by riders including Geoff Duke, John Surtees and Derek Minter. Very quickly the featherbed frame, a design that allowed the construction of a motorcycle with good mass-stiffness distribution,[18] became a benchmark by which all other frames were judged.[17]
Norton also experimented with engine placement, and discovered that moving the engine slightly up/down, forward/back, or even right/left, could deliver a "sweet spot" in terms of handling. Motorcycle designers still use this method to fine-tune motorcycle handling.[19]
In 1951 the Norton Dominator was made available to export markets as the Model 88 with the Featherbed frame. Later, as production of this frame increased, it became a regular production model, and was made in variants for other models, including the OHV single-cylinder machines.
Manx Nortons also played a significant role in the development of post war car racing. At the end of 1950, the English national 500 cc regulations were adopted as the new Formula 3. The JAP Speedway engine had dominated the category initially but the Manx was capable of producing significantly more power and became the engine of choice. Many complete motorcycles were bought in order to strip the engine for 500 cc car racing, as Norton would not sell separate engines.
The racing successes were transferred to the street through cafe racers, some of which would use the featherbed frame with an engine from another manufacturer to make a hybrid machine with the best of both worlds. The most famous of these were Tritons - Triumph twin engines in a Norton featherbed frame.
Despite, or perhaps because of, the racing successes Norton was in financial difficulty. Reynolds could not make many of the highly desired Featherbed frames and customers lost interest in buying machines with the older frames. In 1953 Norton sold out to Associated Motorcycles (AMC), who owned the brands AJS, Matchless, Francis-Barnett and James. In 1962 the Norton factory in Bracebridge Street, Birmingham was closed and production was moved to AMC's Woolwich factory in south-east London.
Under AMC ownership a much improved version of the Norton gearbox was developed, to be used on all the larger models of AJS, Matchless and Norton. Again, the major changes were for improved gear selection. In September 1955 a 600 cc Dominator 99 was launched. The 1946 to 1953 Long Stroke Manx Norton was 79.6 mm × 100 mm (3.1 in × 3.9 in) initially SOHC, the DOHC engine becoming available to favoured racers in 1949. The Short Stroke model (1953 to 1962) had bore and stroke of 86 mm × 85.6 mm (3.4 in × 3.4 in). It used a dry sump 499 cc single-cylinder motor, with two valves operated by bevel drive, shaft driven twin overhead camshafts. Compression ratio was 11:1. It had an Amal GP carburettor, and a Lucas racing magneto. The 1962 500 cc Manx Nortons produced 50 bhp (37 kW) at 6,780rpm, weighed 142 kg (313 lb), and had a top speed of 209 km/h (130 mph).
In 1960, a new version of the road-going Featherbed frame was developed in which the upper frame rails were bent inwards to reduce the width between the rider's knees for greater comfort. The move was also to accommodate the shorter rider as the wide frame made it difficult to reach the ground. This frame is known as the "slimline" frame; the earlier frames then became known as the "wideline".
The last Manx Nortons were sold in 1963. Even though Norton had pulled out of Grand Prix racing in 1954, the race-shop at Bracebridge Street continued until 1962, and the Manx became a mainstay of privateer racing, and even today are highly sought after, commanding high prices.
On 7 November 1960 the first new 650 cc Norton Manxman was launched for the American market only. By September 1961 the Norton 650SS appeared for the UK market, the 750 cc (Atlas). By 20 April 1962 for the American market as they demanded more power,[clarification needed] but the increases to the vertical twin engine's capacity caused a vibration problem at 5500 rpm. A 500 cc vertical twin is smoother than a single-cylinder, but if the vertical twin's capacity is enlarged vibration increases. The 750 Norton Atlas proved too expensive and costs could not be reduced. Financial problems gathered.[20]
There was an export bike primarily for use as a desert racer, sold up until 1969 as the Norton P11,[21] AJS Model 33, Matchless G15 and Norton N15 which used the Norton Atlas engine in a modified Matchless G85CS scrambler frame with Norton wheels and front forks. This bike was reputed to vibrate less than the Featherbed frame model. AMC singles were also sold with Norton badging in this era.[22]
Also during this period Norton developed a family of three similar smaller-capacity twin cylinder machines: first the Norton Jubilee 250 and then the Navigator 350 and the Electra 400, which had an electric starter. These models were Norton's first use of unit construction. The engine was an entirely new design by Bert Hopwood and the frame and running gear were from the Francis-Barnett range, also owned by AMC. These machines had a reputation for poor reliability.
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