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2-speed gear 3-speed gearbox 500 c.c. capacity adopted air-cooled arrangement belt brakes c.c. engine carburettor chain Clyno coil commercial production compact compression ratio considerable continued countershaft crankcase crankshaft speeds cycle cyclemotor cylinder engine Dion-Bouton drove the rear efficient elaborate engine unit example fitted flywheel form of motorcycle four-cylinder four-stroke engine front forks gear ratio gearbox Gilera h.p. single-cylinder Harley-Davidson high-tension Honda horizontally-opposed ignition improved included incorporated increased Indian motorcycle inlet valves Lambretta lightweight machines magneto manufacturers models motor bicycle motor scooter motorcycle design motorcycle engine mounted multi-plate clutch operated overhead-valve pedal performance period petrol piston Plate produced progress prototype pulley push-rod racing engines rear wheel reliability road Royal Enfield shaft drive side-valve sidecar single-cylinder engine specific outputs spray carburettor Suzuki Tourist Trophy Tourist Trophy Race tricycle Triumph tube twin-cylinder twin-cylinder engine two-stroke engine tyre variety vee-twin cylinder vehicles Velocette Vespa Villiers Yamaha Zundapp