28 Фев 2015 | Author: | Комментарии к записи AJS 7R отключены
AJS Model 14 250

Cycle World Road

From time to time we to show you an exercise in style and which stands out from breeds as a Chanel original from discount house muu (Voice from the parts how many cylinders does a have?) Style is not easily nor is it generally the result of a conscious in design: one has to look only at of the chrome-tank English Twins of the or bloated Japanese multis to see the in that although everybody a nice girl who is as homely as the of a bus. Still.

The subject of our is the AJS 7R, one of those happy marriages of curves and lines that a harmonious whole and the daring who thought of gold paint anodized) for the mag crankcases and cam-drive wrought better than he I am sure that the 7R riders just a little faster they looked nice. that is why KTT Velocettes were so

At any rate the cobby lines, tank, businesslike engine and curve of the exhaust pipe the 7R one of those unmistakeable silhouettes bring enthusiasts on the run from the end of the paddock. Isn’t that

The 350-cc ohc Boy’s Racer. so because it was produced as a reasonably customer’s machine, was brought out in at a difficult period in AJS racing and although not outstandingly rapid at proved to be both reliable and over its 14 year production run and as served as a nursery for many of international repute. In common most English bikes, its roots lay way in the past, in this the celebrated cammy AJS introduced in

The parent firm, known as Stevens Brothers, started out in the way in the late 1890s fiddling various proprietary engines but in the company decided to market amounted to a 29cc flathead-powered bicycle under the name of for Albert John Stevens only brother with a initial) and furthermore to run it in the TT. Results not all that remarkable but the company in 1914 bringing out an ohv 350 with an gearbox giving four in all. With this AJS up the 350 class, taking the 1st four plus 6th and the company was on its way.

Development on the sly during the war ensured Ajays were ready for the TTs afterwards with an inclined-valve, chamber 350 which, after the teething troubles and a bit of strategic managed to take the Junior times on the trot. This win, in 1922, saw the introduction of the big port Ajay which had a fairly thorough redesign not only cams as big as their but an exhaust port of something 2 5/8 in. a sort of odd modification when at some of today’s bikes but at time fuels, compression (5.75:1), cam timing etc. may dictated different ideas scavenging.

At any rate these models are still recherche vintage freaks. The following showed that inventive were working at the factory, with the introduction of aluminum with cast-in bronze foot pedals for both expanding brakes to leave the hands free for his multitude of levers (including throttle!), dry lubrication, and even going to the inlet valve becoming than the exhaust.

At the same the racers still featured a oil pump most of the time as as the cylinder head being down by a sort of strap or At any rate, Ajays were racing energetically and placing but not up with wins in the TT, a significant of success to the buying public in palmy days.

Following an ohc win in 1926 a new machine was brought out in with chain-operated ohc (three for two valves at 900), dry sump, and four-speed gearbox still by a hand change. This was the of the 7 series which, after a start, won many laurels up the years in 250, 350 and slightly even in the Senior.

Numerous modifications were including getting rid of the extra and their success even have been greater but for of accessory components. Isn’t it the way.

Racing is expensive, as a number of manufacturers have out and in a marked period of short (1931) the Stevens brothers bust and the factory was sold to Development went on, including of a recordbreaking (would-be) Twin and a which could be supercharged and in was raced in that form, one of type doing a 100 mph lap (Walter up) in Ulster.

Emphasis thus over to bigger bikes, without much luck in due to a rather limited development In fact the famous but unlucky Twin was originally designed as a bike but was forced to run with due to the usual FIM policy change the 1941 war. In this it did win some races but mostly a lot more weight than was needed.

With all the real from Europe now appearing on the AJS then thought that it was to resurrect the cammy 350 and as noted, it out in 1948. Considerably more than its predecessor, if you can say that any English hike, the 7R was raced, successfully by works riders of the of Les Graham, Bill Doran, Reg ad infinitum against the likes of and Frith (Velocettes) plus and Lockett (Nortons) with results for what amounted to a new mostly.

As the years wore on began to give rewards and successes were notched by the works and the myriad private especially as Velocettes were now on the of becoming orphans. In an effort to more power out of the 7R, in 1952 AJS out a triple knocker version three valves, two of them (back to the Big Port syndrome!) were worked by a geared running off the inlet camshaft, lucky object taking the direct from the cam chain.

This version was quite and took some 13 world’s at Montlhery in 1952, including the at 115.66 mph. Furthermore, New Rod .Coleman finally won the Junior TT on teammates finishing second and and hopes began to be expressed the 7R 3A would also be put into production along side its cam brother. But this was not to be, Matchless’s showing the same far-sightedness led to the collapse of most of England’s factories. To be sure, the Matchless G45 and both derived from made one small … upon the scene but the foreign were upon them and in manufacture of the beloved 7R ceased, to be four years later by the of AMC (the parent firm) and its up by Dennis Poore’s Manganese Holdings, for all the good that did

A of signal success in the TTs did not necessarily that a bike was no good. Norton and Velocette had been the Island for years, having the absolutely taped as Harley the dirt tracks over and also took care to Island specialists who could and did go at 100 mph (like the legendary Harold when you couldn’t see your before the face.

The 7R was put out as a customer’s primarily, which meant the ultimate Nth wasn’t dragged out of it; in a where development costs somewhat limited, most of the allotted went to the turkey However 7Rs were quite found among the works at the TT in a good place and in the hundreds of Continental and English contests the owner-driver-mechanic had to live out of his van, the qualities and good handling in many victories. Fastest lap is all well but the checkered flag

This particular example is a model updated to 1961 owned by William A. Bass a consulting engineer of Long Calif. The machine was imported England some time in possibly bought new, and some racing and passing several sets of kind (the bike is unrestored for the tank) was snatched up by Bill to the other goodies in his garage.

AJS Model 14 250

the 7R engine is a Single (!) with an square bore and … (75.5 x 78 mm) giving something 42 bhp at 7800 rpm. The bottom end is sturdy with smallish to cut oil drag and a caged roller on the big-end of the forged steel rod a titanium one was used occasionally.

is a full-skirted four, ring model with cutouts in the domed top and the rh crankpin drives two oil plus a Weller-tensioned chain up to the The light-alloy cylinder has an austenitic liner shrunk into it but the the heart of any racing engine, most of the trick ‘work.

Of the light alloy with aluminum bronze or austenitic valve seats (inlet and respectively) the camboxes have for the mousetrap valve springs, usually. By 1953 roller were fitted on the two rockers and a lot of work by engineer and former TT C.J. Williams on the head the 1956 series improved it

The engine was originally meant to run on Pool petrol which was like Mexican regular gas and C.R came out something like With the advent of better or even alky (Bill’s 7R either Avgas or methanol) Mr.

airflowed the head by one of those test-rigs that the Poms to specialize in and came to the conclusion a slightly down-swept port gave better mixing, a 13 1/8 in. inlet tract reduced a 13/8 Amal was just the and a squish pattern head CR to be raised to 12.2:1. Power all the range as well as improved consumption was the result.

Externally the 7R doesn’t look too different from its predecessors but in the new frame holds the mag crankcases firmly, the vibration-producing alloy from the engine to the top of the gearbox has replaced with a decent one, the giant early which resulted in about a 500 rpm band was replaced with a reverse cone mega, and the jampot rear shocks to wherever old shocks go and Girlings their place. The lovely with cutouts for knees is by an adjustable strap across the top (to for fitting sprint tanks) and a useful 5 gallons while the contoured dry-sump oil tank 7 pints; these are probably measurements and in the US we can squeeze a bit more in.

suspension is looked after by AJS forks which seemed to all right. I asked a Knowledgeable whether Norton forks ever fitted as they on many of the Triumph GPs and he said the Norton ones were too one of the main advantages of the 7R was its comparatively weight of 285 lb. and no wonder with mag cam boxes, timing cover, cover and hubs at both

Gearbox of course was a four-speed with final drive of it is no good going into as they have probably modified endless times, and the dry exposed on the left side, is a Ferodo-faced unit familiar to all by the smell it makes when Also in the English tradition are the to find 19 in. wheels fitted Goodyears front (3.0019 2.75 is recommended) and rear although 3.25 ditto).

I about to ride the 7R in the teeming around the Queen Mary, with a rather loud fitted, so we have to rely on the of owner Bass. He states the bike is absolutely delightful and like a Ducati which make both Italians and feel happy. Under way the is smooth, light and agile, able to be flicked about, and the in moment of stress are v good for non

Like all small-capacity racing the Single is extremely peaky and at low rpm hardly pull its own weight, a lot of clutch slip (perhaps why the IOM start is downhill) but commences on the pipe to give some power at around 5800, strongly from then on to at 7400. His top speed at the present he has calculated at around 120 mph well in and the Lucas rotating armature mag to keep up with that… or has in the although he confides that at the Vintage meeting at Laguna he had a feeling that the Prince of better have his brushes Starting drill is also practice; tickle the hell out of it, the spark, bump back compression, snick into low pull in the clutch and run like preferably with the aid of a few friends, and aboard. A hot plug (usually a is usually fitted for warmup and rather colder, one of Champion’s Palladium range, fitted for work

AJS Model 14 250
AJS Model 14 250
AJS Model 14 250

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