“五羊”、“嘉陵”、“佛斯第”等车型的排气消声器底部,在最低位置有一直径约3毫米的小孔。此孔是为排除内部冷凝水,防止消声器锈蚀而设计的。摩托车在行驶时,此孔很容易被泥土和内部污物堵塞,使冷凝水不能排出,在高温作用下,很快使筒壁生锈,并形成恶性循环,大大缩短排气消声器的使用寿命。 “Wuyang”, “Jialing”, “Fosti Di” and other models at the bottom of the exhaust muffler, at the lowest position there is a hole about 3 mm in diameter. This hole is designed to eliminate internal condensation and prevent rusting of the muffler. Motorcycle driving, the hole is easily clogged with dirt and internal dirt, so that condensate can not be discharged under the action of high temperature, quickly rusting the cylinder wall, and the formation of a vicious circle, greatly reducing the exhaust muffler life .