Why does CG 125 injector motorcycle always loosen the valve clearance?

It is possible that the valve seat of the valve and cylinder head is worn, which leads to the tightening of the valve sinking clearance. Generally, the valve clearance is not used, so it should not be adjusted, otherwise problems will easily occur. Ejector machines are particularly prone to "valve sound" similar to atmospheric valve clearance, which is not necessarily a fault. If it is adjusted frequently or the clearance is adjusted too tightly, it is easy to wear the valve rocker arm and camshaft, resulting in a larger clearance or other related failures. If the valve clearance is often tightened, first confirm whether the original clearance is too tight. If it is still not adjusted after repeated adjustments, remove the cylinder head and cylinder block and check whether there is any problem with the components of the gas distribution system.