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3-speed 4-speed gearbox adjustable air-cooled cylinder air-cooled engine aluminium attached automatic ball-bearings belt bicycle frame bolted bore Bowden wire brake c.c. capacity camshaft carburettor carries chain chamber choke tube clutch coil compression connecting rods contact breaker controlled crank crankcase crankshaft cycle cylinder head detachable diam drive enclosed Eng1ne exhaust valve fins fitted fixed flange flywheel front forks front wheel gear ratios gearbox gudgeon pin handlebar lever high-tension magneto horizontal ignition incorporated inlet valve kick starter layshaft Lent by Messrs magneto mainshaft Motor B1cycle motorcycle engines mounted operated overhead valves patented pedal petrol pipe piston pivoted Plate ports Presented by Messrs pulley rear wheel rocker roller roller chain rotated running screwed sectioned example shaft shock absorber side single-cylinder sleeve spindle spray carburettor spring fork sprocket stroke tank top tube two-stroke engine tyres Velocette vertical Villiers Engineering