This model is offered purely for racing purposes and can be supplied only with full racing equipment. It is, so far as is commercially practicable, a replica of the actual A.J.S. racing machines which have during recent seasons put up such a remarkable display of high speed reliability in the Isle-of-Man T.T. Races, the Ulster Grand Prix, and many other important races.
Before delivery every machine is tested under racing conditions at Brooklands Racing Track and is not passed for delivery unless it has achieved a set minimum lap speed. It should be specially noted that no deviation can be made from the specification given below and that these machines cannot be supplied with electric lighting equipment.
General Specification
ENGINE. A.J.S. high efficiency overhead camshaft dry-sump engine, similar in design to those used in the Isle-of-Man T.T. Races. The cylinder head is cast in aluminium alloy with inserted valve seats. Aluminium cylinder barrel with special alloy liner. The cast aluminium rocker-box is of the sump pattern affording ample lubrication to the camshaft chain and timing gear mechanism. The driving side mainshaft of very sturdy design running in four row roller bearing. Valve stems and valve guides mechanically lubricated. The piston, which is cast in special alloy, gives a compression ratio of 8.5 to 1. Capacity, 346 c.c.
IGNITION. B.T.H. racing magneto.
GEARBOX. Heavyweight four-speed racing gearbox with positive stop foot change. No kickstarter.
CLUTCH. Multi-plate clutch of T-T pattern.
WHEELS. Both wheels fitted with taper roller bearings. Rear wheel is of quickly detachable type.
TYRES. 27 in. x 3.25 in. triple studded rear and 27 in. x 3.00 in. ribbed front.
MUDGUARDS. Racing pattern.
FORKS. Sturdy design fork girder assembly giving maximum lateral rigidity. Double lock fork spindle assembly and double duplex integral dampers. Rebound check springs.
STAND. Centre spring-up stand, quickly detachable.
FRAME. Semi-duplex type with triple rear fork members, ensuring absolute rigidity at high speeds. One piece cradle engine plates carrying engine and gearbox.
TANKS. Identical with those used in the 1937 Isle-of-Man T-T Races. Petrol tank finished in usual A.J.S. black and gold. Capacity, 4½ gallons. Oil tank capacity, 1 gallon.
CARBURETTOR. Latest Amal racing type, with quick-action twist grip.
CHAINGUARD. Top run chainguard to front chain giving adequate protection. Special oil lead to chain.
EXHAUST SYSTEM. Straight through exhaust pipe, downswept pattern, with detachable megaphone trumpet.
FOOTRESTS. Racing type footrests mounted on rear frame, affording ideal riding position for high speed work.
SADDLE. Terry racing saddle and Moseley mudguard pad.
Price TO STANDARD SPECIFICATION AS GIVEN ABOVE 90 GNS.
PAGE 22
Source: AJS Factory Catalogue 1938
