What's the sound of the double exhaust pipe of Prince 150 motorcycle?

Carburetor throttle knocking, air leakage, valve knocking. The noise from the double exhaust pipe of Taizi 150 motorcycle is caused by the carburetor valve and valve, so it is the knocking sound of carburetor throttle, air leakage sound and valve knocking sound. When idling, the knocking sound of the carburetor throttle is almost inaudible, and the noise is the biggest when the throttle is turned to 1/u002F4. When the throttle is increased, the noise gradually decreases. When the throttle is turned to the end, the noise disappears. The sound of air leakage is between the cylinder and the cylinder head, between the cylinder and the crankcase or between the left and right crankcase. The knocking sound of the valve means that if the valve clearance becomes larger due to improper adjustment or parts wear, the valve mechanism will make a short and sharp knocking sound, which does not change with the change of speed and can be eliminated by adjusting the valve clearance or replacing worn parts.