How to Modify a Single-Cylinder Motorcycle to Produce a Muffled Sound?

[VonGia]

Cut open the exhaust pipe and replace the muffler padding to produce a muffled sound. Below is relevant information about motorcycle exhaust pipes: 1. Back Pressure Pipe: The back pressure pipe utilizes partitions, mufflers, or volume changes inside the pipe to generate pressure that returns to the cylinder. When the engine ignites, pushes the piston downward, and the exhaust valve opens, the returning pressure from the exhaust pipe blocks the exhaust gases from rushing out, allowing the combustion pressure to continue pushing the piston to the bottom dead center. Advantages include quiet operation and good low-speed response, while the disadvantage is reduced high-speed power output. 2. Straight Pipe: The straight pipe has no internal partitions or similar features, only external muffler padding to block some noise. Exhaust gases are discharged directly without obstruction, producing explosive sounds under intense expansion, commonly known as noise. Advantages include smooth exhaust and enhanced power, while disadvantages are poor low-speed performance and high noise levels.