Brother Qiao _ Why did the throttle line become single?

Two throttle lines are an extra insurance.

One for the oil filler and the other for the throttle pressure reducer. In CB 125T series, the equal vacuum carburetor adopts this structure. Theoretically, it is to prevent the rotary valve throttle from returning and locking, which leads to flight accidents, but it rarely happens in practical application. So it doesn't matter if you don't install the reverse throttle line.

The two lines of the motorcycle lead to the throttle handle on the right side of the handlebar, so the top one is the throttle line, which is responsible for controlling the throttle and the oil needle, that is, controlling the throttle. Next to it is the acceleration pump pipeline, which can make the carburetor spray an oil to the throat when the throttle turns sharply, so as to improve the acceleration when the throttle turns sharply. This accelerator pump only works when the throttle is sharp, but it doesn't work when driving normally or the throttle is slow.