What are the manifestations of excessively tight motorcycle valves?

[SanJesse]

Here are the manifestations of excessively tight motorcycle valves: 1. Valve noise: The most common issue caused by excessive valve clearance is abnormal noise, primarily stemming from the collision between the rocker arm and the valve, necessitating timely adjustment. 2. Power reduction: The main reason for power loss due to excessive valve clearance is the subsequent decrease in intake and exhaust volumes, primarily because the valve opening becomes smaller, thereby affecting the engine's intake and exhaust volumes. 3. Accidental damage: If excessively tight valve clearance is not promptly adjusted, for pushrod engines, there is a possibility of pushrod detachment because the pushrod relies on the upper and lower rocker arms for positioning. If the clearance is too large, the pushrod may shift, leading to detachment.