How does the throttle mechanism work in motorcycles?

In contrast to cars that use electronic throttle control for propulsion, motorcycles use a throttle cable mechanism.
What is controlled by the throttle valve is essentially the volume of air entering the intake manifold.
As the accelerator is progressively squeezed, the throttle plate (butterfly valve) rotates within the throttle body, opening the throttle passage to allow more air to swoop into the intake manifold.

Now,

For Fuel Injected Bikes: An airflow sensor measures this change and communicates with the Electronic Control Module (ECM). The ECM communicates this information further to the fuel injectors, increasing the amount of fuel being injected into the combustion chamber(s).

For Bikes with Carburettor: The Carburettor has a Venturi-like shape, increasing airflow velocity further, causing a low-pressure region. This is due to Bernoulli's principle (i.e. as the velocity increases, the pressure falls). This low-pressure region sucks in more fuel from the float chamber causing more fuel-air mixture to enter the cylinder(s).

Install and feel the power BRT offers: BUY NOW