Some fault as : ignition timing, not too thick or thin mixture, the distributor platinum, valve clearance adjustment screw loose the louder, generally necessary adjustment can be eliminated. 有些故障如点火不正时、混合气过浓或过稀、分电器白金间隙不合适、气门调整螺丝松动等造成的异响,一般进行必要的调整即可排除。