How to adjust the valve of suzuki king GN 125 motorcycle? I adjusted it myself. It's loud urgent

Generally speaking, the valve sound is not loud, that is, the valve sound is not obvious and should not be adjusted. Also, if the idle speed is not good, you can check it. After the engine is used for a long time, the valve clearance will change. After the adjustment, the sound is very loud, and the gap must be too big. If you have a feeler gauge, measure it. To adjust the valve of GN 125, first open the small cover on the magnetoelectric machine. There are two, one on the crankshaft and one on the observation hole. Open the observation hole and find a small point on the magnetic steel. The point is right in the center of the observation hole, and then the valve can be adjusted. If you don't have a feeler gauge, you'd better find a professional to help you.