![]() ![]() The solution was a dual or double cable system throttle grip system that found favour in twin-cylinder motorcycles in particular. Hence engineers devised an efficient way to do the job. The previous throttle grip arrangement of operating the spring loaded slide mechanism by a single pull cable was found to be inadequate with the newer CV type of carburettors. A cable operates the slide throttle valve that controls the air volume and indirectly controls the slide’s movements up or down as vacuum is created in the system. These carburettors are very similar to the traditional ones. With these innovations came the efficient Butterfly slide throttle valve type or Constant Velocity (CV) carburettors for motorcycles. Over the years, as machines became more sophisticated and powerful, the fuel delivery system was also improved and technologically modernised. These formats were typical for production motorcycles for many years. With popularity gaining, the early 60s saw the advent of custom machines by specialists.Īpart from advances in the engine department, engineers also looked into ways of improving fuel delivery systems for efficiency and performance.Įarlier, traditional flat or cylindrical slide-operated type of carburettors that worked on the ‘Venturi’ principle wherein the flow of air is forced into narrow tubes to increase its speed and resulting in pressure drop resulting in a suction effect were operated by single-cable twist grips. This was true for motorcycles either with 2-stroke or 4-stroke engines.Īs the motorcycle business began to flourish post WWII, manufacturers began offering motorcycles in various displacements and configurations.Īlong with displacement variants came single, parallel and V- twins, in-line triples, in-line four-cylinders and even six-cylinders. Most motorcycles built in the early days of evolving mechanised 2-wheeler segment came with a single-carburettor set-up fed with a single cable operated throttle system. Interestingly, the first commercial application of the throttle grip on a motorcycle handlebar was done in 1904 by American motorcycle manufacturer Indian Motorcycles. Roper is acknowledged as the creator and guru of the modern twist throttle system that he introduced to the motorcycle world in 1867. In earlier motorcycles, the throttle cable was lever operated, but as it became clear eventually, such an arrangement wasn’t very practical and had its own share of drawbacks.Īfter long deliberation, the current twist grip format was accepted as the best solution almost three decades after it was originally designed.Ĭredit for the modern twist grip throttle system for motorcycle without doubt goes to super talented inventor and builder of automobiles and motorcycles from Boston, Massachusetts in America, Sylvester Roper. ![]() The physical mechanism for throttle control has been experimented over the years with various types of mechanical contraptions. Without this mechanism, it wouldn’t be possible to operate the carburetor valves and control the air-fuel mixture inside the engine. Its operational principle - that is to pull or push the throttle slide inside the carburetor remains unchanged till date. The throttle mechanism in motorcycles that have been around since 1885 has remained as a constant element in its evolution. Specific machines have been designed with specific throttle architecture that complements the set-up and packaging. ![]() While it has a common role, but differs when it comes to application in specific types or classes of motorcycles. ![]() In each bike, the throttle hardware is responsible for controlling the air-to-fuel ratio into the engine. It’s no secret that there are riders who are particularly choosy as to what type of motorcycle they will ride - be it a commuter bike that takes them from point A to point B, a flashy super bike that’s fast and furious on asphalt and track, a dual-purpose on-off road machine or just an adventure bike. Throttle response calibration depends on the overall configuration of the motorcycle. What Is Throttle Mechanism In Motorcycles? A Brief History
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