How is the motorcycle's throttle operated to increase engine speed?

The throttle on a motorcycle is operated by twisting the right handgrip, which is designed to control the amount of fuel and air entering the engine. To increase engine speed, you twist the grip toward yourself, which essentially opens the throttle and allows more fuel and air into the engine. This action increases the power output of the engine and allows the motorcycle to accelerate.

The design of the throttle grip follows the natural motion of the wrist, making it intuitive for riders to increase speed while maintaining control of the handlebars. Properly understanding throttle operation is essential for responding to different riding situations, from accelerating smoothly to adjusting speed in curves.

In contrast, the other choices do not correspond with the conventional operation of a motorcycle throttle. Lifting it up or pressing down are not functions of the throttle for increasing speed, and twisting it away from you would actually decrease engine speed. This highlights the importance of familiarizing oneself with motorcycle controls for safe and effective riding.