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Difference between revisions of "AJS 7R"
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{{ | {{DISPLAYTITLE:{{PAGENAME}}: review, history, specs}} | ||
{{Motorcycle | |||
|name = AJS 7R | |name = AJS 7R | ||
| | |photo=7R.jpg | ||
|aka = | |aka = | ||
|manufacturer = | |manufacturer = AJS | ||
|parent_company = | |parent_company = | ||
|production = | |production = 1948 - 1953 | ||
|model_year = | |model_year = | ||
|predecessor = | |predecessor = | ||
|successor = | |successor = | ||
|class = | |class = Classic | ||
|engine = | |engine = air-cooled, four-stroke, single cylinder, OHC | ||
|bore_stroke = | |bore_stroke = 76.2mm x 76.2mm | ||
|compression = | |compression = 12.2:1 | ||
|top_speed = | |top_speed = | ||
|power = | |power = 39.96 HP (29.8 KW) @ 8000RPM | ||
|torque | |torque = | ||
|ignition = | |||
|ignition = | |spark_plug = | ||
|spark_plug = | |battery = | ||
|battery = | |transmission = Gear box: 4-speed, manual <br> | ||
|transmission = | Final Drive: [[chain]] <br> | ||
|frame = | Clutch: dry, multiplate <br> | ||
|suspension = | |||
|brakes = | |frame = | ||
|front_tire = | |suspension =Front: telescopic fork <br> | ||
|rear_tire | Rear: dual shocks | ||
|rake_trail = | |brakes =Front: drum <br>Rear: drum | ||
|wheelbase = | |front_tire = 2.75 x 19 | ||
|length = | |rear_tire = 3.50 x 19 | ||
|width = | |rake_trail = | ||
|height = | |wheelbase = | ||
|seat_height = | |length = | ||
|dry_weight = | |width = | ||
|wet_weight = | |height = | ||
|fuel_capacity = | |seat_height = | ||
|oil_capacity = | |dry_weight = | ||
|fuel_consumption = | |wet_weight = 129.0 kg | ||
|turning_radius = | |fuel_capacity = 1.59 Gallon (6.00 Liters) | ||
|related = | |oil_capacity = | ||
|competition | |fuel_consumption = | ||
|turning_radius = | |||
|related = | |||
|competition = | |||
}} | }} | ||
The '''[[AJS]] 7R''' was a air-cooled, four-stroke, single cylinder, OHC Classic [[motorcycle]] produced by [[AJS]] between 1948 and 1953. Claimed [[horsepower]] was 39.96 HP (29.8 KW) @ 8000 RPM. | |||
==History== | |||
[[AJS]] introduced a new chain driven overhead cam single cylinder racing [[motorcycle]] for the 1948 season. Named the 7R it became a legend in its own lifetime winning numerous races at all levels including the Manx and Grand Prix, a tradition that it continues today in classic events. | [[AJS]] introduced a new chain driven overhead cam single cylinder racing [[motorcycle]] for the 1948 season. Named the 7R it became a legend in its own lifetime winning numerous races at all levels including the Manx and Grand Prix, a tradition that it continues today in classic events. | ||
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A break in competition occurred for the 7R until 1982 when the she took part in the TT Parade and subsequently started to compete in Classic Club meetings until 1991 and also took part in the 1989 Kennings Championship, finishing second overall. After Mr Hunt retired from competition the bikes engine and gearbox were used by Eric Kirk for the 1991 Manx who went on to race the complete machine at the 1994 Manx. For the 1995 Manx she returned to the Island with Robert Hirst in the saddle finishing 8th with an average speed of 91.51mph and would return for the Manx every year until 2002. Following her retirement she has been used for the occasional parade. | A break in competition occurred for the 7R until 1982 when the she took part in the TT Parade and subsequently started to compete in Classic Club meetings until 1991 and also took part in the 1989 Kennings Championship, finishing second overall. After Mr Hunt retired from competition the bikes engine and gearbox were used by Eric Kirk for the 1991 Manx who went on to race the complete machine at the 1994 Manx. For the 1995 Manx she returned to the Island with Robert Hirst in the saddle finishing 8th with an average speed of 91.51mph and would return for the Manx every year until 2002. Following her retirement she has been used for the occasional parade. | ||
The most popular AJS racebike was the single-cylinder [[AJS 7R|350cc 7R]], known as the "Boy Racer". Introduced in 1948, the 7R was hugely successful and was later enlarged to 500cc to make the [[Matchless G50]]. | |||
==Engine== | |||
A 76.2mm [[bore]] x 76.2mm [[stroke]] result in a [[displacement]] of just 349.0 cubic centimeters. | |||
==Drive== | |||
The bike has a 4-speed, manual transmission. Power was moderated via the dry, multiplate. | |||
==Chassis== | |||
It came with a 2.75 x 19 front [[tire]] and a 3.50 x 19 rear tire. Stopping was achieved via drum in the front and a drum in the rear. The front suspension was a telescopic fork while the rear was equiped with a dual shocks. The 7R was fitted with a 1.59 Gallon (6.00 Liters) fuel tank. | |||
==1948 - 1963 AJS 7R== | |||
[[File:ajs-7r-1948-1963-0.jpg|600px|1948 - 1963 AJS 7R]] | |||
The 350cc AJS 7R was a racing motorcycle built from 1948 to 1963. In the beginning, the 7R was not too powerful, producing 32HP at 7500rpm. In 1956 the engine dimensions changed from the original long-stroke 74 x 90 mm to the 75.5 x 78 mm. In 1951 there was a version called AJS 7R3, with 36HP and a mellow tuning of the bike increased its power to 40HP in 1954. The AJS 7R could reach a top speed of 110-115 mph. | |||
==1953 AJS 7R== | |||
[[File:ajs-7r-1953-1953-0.jpg|600px|1953 AJS 7R]] | |||
The 1952 AJS 7R has, at its heart, an air-cooled, four-stroke, 349cc, single cylinder powerplant mated to a four-speed manual transmission, and can produce a claimed 40 horsepower at 8000 rpm. This machine has had repeated success at the Junior Isle of Man TT, making it one of the most sought after machines in its class. Standard features include a telescopic front fork, dual shocks as a rear suspension, a dual seat, a large, 23-liter (6-gallon) fuel tank, a small windscreen, a blacked-out frame and laced wheels. | |||
==In Media== | |||
* [https://motopixel.org/pixel/perlicky-na-dne#ajs-7r Perličky na dně] | |||
* [https://motopixel.org/pixel/nuoruus-vauhdissa#ajs-7r Nuoruus vauhdissa] | |||
* [https://motopixel.org/pixel/kdyby-ty-muziky-nebyly#ajs-7r Kdyby ty muziky nebyly] | |||
* [https://motopixel.org/pixel/goodwood-revival-meeting#ajs-7r Goodwood Revival Meeting] | |||
[[Category:AJS]] | [[Category:AJS]] | ||
[[Category:AJS motorcycles|7R]] | |||
[[Category:1940s motorcycles]] | |||
[[Category:1950s motorcycles]] | |||