SpecificationsRudge Sports Special 500cc 1939
ENGINE. - 495 c.c. Bore 84.5 mm. Stroke 88 mm. Rudge system FOUR OVERHEAD VALVES, with completely enclosed and pressure lubricated operating gear. Tubular valve operating rods. Polished Ports. Double row roller big end bearing, with duralumin cage. Piston " Aerolite " close clearance, non slap. Cylinder of wear-resisting NICKEL-CHROME IRON to Rudge special specification, has deeper finning and much improved appearance. Engine bench tested and stripped for inspection before road test.
DETACHABLE CYLINDER HEAD MAY BE REMOVED WITH THE PETROL TANK IN POSITION.
LUBRICATION. - Dry sump entirely automatic designed to operate without adjustment. The oil is fed under pressure to the big end,
cylinder head and cylinder, and returned to the oil tank through a Tecalemit filter of large area,
ELECTRICAL EQUIPMENT. - B.T.H, Magneto and Miller Dynamo, driven by chains running in an oil bath. 8in. head lamp, Exide battery.
High frequency electric horn.
CARBURETTER. - Amal, needle type. Twist grip throttle control. Handlebar lever air control,
BRAKES RUDGE PATENTED (Patent No. 260,656) PROPORTIONAL COUPLED BRAKES,
8in. diameter front, 7 1/2in, diameter rear FINGER ADJUSTMENT TO BOTH FRONT AND REAR. Die cast aluminium shoes.
PETROL TANK. - Rudge " Aero " model, furnished with central filler cap and handsomely finished. Fitted with large pneumatic knee grips. Capacity approximately 3‘, gallons, 2-lcvei petrol tap, providing an emergency reserve supply sufficient for 25 miles
OIL TANK. - Separate oil tank, with large filler and drain plug, provides efficient cooling. Capacity half-gallon.
HANDLEBARS. - Adjustable semi-Sports type, 7/8 in, diameter, with black celluloid covering, fitted with long front brake lever, and Sinks quick action twist grip. Adjustable steering damper
MUDGUARDS. - Sports section guards with flared ends. The rear guard is fastened to the frame by wing bolts, making it easily detachable.
STANDS. - Tubular stand for front wheel, parking stand central spring-up type, with easy-to-operate hand lever, Rudge Whitworth patent. (Patent No. 359089).
GEARBOX AND CLUTCH. - Rudge-Whitworth patent four-speed (Patent No. 331643). Gears in CONSTANT MESH. Kick starter mechanism ENCLOSED, Positively operated foot-change on right hand side of machine. Multi-plate clutch enclosed in oil-tight cover to eliminate slip or drag. Solo gear ratios: 4.74 to 1; 5.89 to 1 ; 7,65 to 1; 13,9 to 1.
EXHAUST SYSTEM. - Advanced design, permitting very high performance with commendable degree of silence. Two large diameter wide angle upswept exhaust pipes from cylinder head to two cylindrical silencers, with tail pipes incorporating absorber tubes. Heavy chromium plate throughout. Low level exhaust pipes optional.
FINISH - The outstanding Rudge Quality finish, multi-coat, superfine black enamel on RUSTPROOF UNDERCOAT, lined brilliant bronze. Bright parts heavily chromium plated on nickel, ALL PROMINENT BOLTS ARE CAPPED WITH DOMED NUTS. Blue or Maroon enamel. £1 extra.
Petrol tank finished in striking chromium plate and black design, with sold lines.
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