SPECIFICATION.
ENGINE - Of "A. J .S." design and manufacture, Single-cylinder vertical. Bore 79 m.m. Stroke 10xx m.m. Capacity 495 c.c. Detachable cylinder head with down-draught inlet port and single-exhaust port. Accessible camshaft drive gear for dismantling, specially designed aluminium alloy piston with fully floating gudgeon pin and three narrow rings. Connecting rod, O.H.C. rockers, etc., machined from special steel. Roller bearing . big end, and ball bearings to both driving-side and timing-side mainshafts. The camshaft is driven by roller chain with patented tensioning device and re-action damper - interior surfaces of the engine are specially finished and highly polished. Piston bodies of various compression ratios for use with straight petrol, petrol benzol and Discol fuels are available. The compression ratio of the standard Competition engine is 6 to 1, and Racing engine 7.5 to 1, and a spare piston having a ratio of 11 to 1 is available. Vernier setting device for ignition timing.
GEAR BOX - Four-speed. Foot operated gear change with positive stop. Foot lever conveniently situated on offside of machine. Competition Ratios: Top 4.70, third 5.68, second 8.32, bottom 13.95. Racing - Close ratios: top 4.7, third 5.68, second 6.86, bottom 12.08.
TOOL BOX AND EQUIPMENT - Metal covered, lined tool box carried between rear chain stays, comprehensive set of tools.
EXHAUST SYSTEM - Upswept with round type silencer on Competition Model. Straight-through on Racing Model.
CARBURETTOR - "Amal" large bore needle-type Carburettor with throttle stop and quick-action twist grip fitted to Competition Model. "Amal" Racing Carburettor fitted to Racing Model.
FRAME - Semi-duplex type with triple rear fork members ensuring absolute rigidity at high speeds.
PETROL TANK - Capacity approximately two gallons in Competition Model, 3½ gallons on Racing Model. Competition finished in the usual "A.J.S." style with black and gold panels on chromium. Racing : Black and gold finish. It is situated behind the saddle down tube and is fitted with a
OIL TANK - Capacity 5 pints. quick-action hinged filler cap.
LUBRICATION - Dry sump system is employed and a fabric filter is included in this, ensuring the removal of all impurities from the oil in circulation Separate feeds are also taken to the cylinder base, valve guides and rocker box, which has its own scavenging pump.
IGNITION - Lucas racing magneto or racing magdyno with detachable dynamo portion, usual handlebar ignition lever control.
CHAINS - " Renold " front ½ in. x .305 in. running in oil bath. Rear chain size 5/8 in. x 3/8 in., with ordinary top half chain cover for accessibility.
PRICE to Standard Specification :
RACING MODEL £ 75-0-0
COMPETITION MODEL £ 70-0-0
From the 1934 AJS Catalogue
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