To gain more power when accelerating, you should:

To gain more power when accelerating on a motorcycle, twisting the throttle down and forward is the most effective method. This action allows you to increase the engine's output by directing more fuel and air into the engine, resulting in a more powerful acceleration. The throttle controls the engine's RPM (revolutions per minute), and by twisting it, you increase the power delivery to the rear wheel.

In contrast, pulling the clutch while revving the engine can help in certain situations, such as preparing to launch from a stop, but it does not immediately deliver power to the wheel. Leaning forward heavily may help with weight distribution and stability at high speeds, but it doesn't directly enhance the acceleration power from the engine. Shifting your weight back can improve traction in certain scenarios, particularly on rough surfaces or during hard acceleration, but again, it does not increase the engine's power output. Thus, the most straightforward and effective method for enhancing acceleration power is to twist the throttle correctly.