SpecificationsRudge Ulster 500cc 1939
ENGINE. - 499 c.c. Bore 85 mm. Stroke 88 mm. Well-known RUDGE system high efficiency arrangement of FOUR OVERHEAD VALVES - two radial exhaust and two parallel inlet-fitted in an aluminium bronze cylinder head with 14 mm, central plug. PORTS AND COMBUSTION CHAMBER POLISHED. Completely enclosed and pressure lubricated valve operating gear, tubular valve operating rods.
THREE-ROW ROLLER BIG END BEARING with duralumin cage. Designed for VERY HIGH PERFORMANCE, with SLIPPER TYPE PISTON, HIGH LIFT CAM, and RACING VALVE SPRINGS, Cylinder of special wear-resisting, NICKEL-CHROME IRON to Rudge 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, the 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. 260656) 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 1/2 gallons. 2-level 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.
FOOTRESTS. - Easily adjustable. Serrated hangers, giving wide range of adjustment. Fitted with thick rubber pads. Lugs incorporated in chain stays for pillion foot rests.
HANDLEBARS. - Adjustable semi-Sports type, 7/8in. diameter with black celluloid covering, fitted with long front brake lever, and Binks quick action twist grip. Adjustable steering damper.
WHEELS AND TYRES. - Quickly detachable rear wheel. Wheel may be removed leaving chain and brake adjustment untouched. Positive drive through three driving studs and thr«« bolts. Adjustable taper roller bearings. Rear spindle fitted with tommy bar. New pattern Dunlop tyres: (front 3,00 21 (27 x 3in.) ribbed, rear 3.25/20 (27 x 3.25in.) "Universal" are standard on this model,
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. 359069).
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: 4.53 to 1; 5.62 to 1; 7,36 to 1; 13.28 to 1. Sidecar gear ratios: 5.5 to 1; 6,82 to 1; 8.9 to 1; 16.0 to 1.
EXHAUST SYSTEM. - Advanced design, permitting very high performance with commendable degree of silence. Two large diameter wide angle low level exhaust pipes from cylinder head to two cylindrical silencers, with tail pipes incorporating absorber tubes. Heavy chromium plate throughout. Upswept exhaust pipes 30/- extra.
FINISH - The outstanding Rudge Quality finish, multi-coat, superfine black enamel on RUSTPROOF UNDERCOAT, lined brilliant bronze. Bright parts heavily chromium plated cn 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 gold lines.
EXTRAS - Rudge-Whitworth International Six Days type rear hub. " ONE NUT RELEASE ! " 10/- extra.
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