MOTOR SOUND PROBLEM: @

Guys, there's a weirdness in the engine sound. The vehicle used to work very quietly, now sounds like a hawk. I keep the sound of the valves very clear. click sound is coming. The valves are loose, but 3-4 months ago I had the valve adjusted. Need to adjust the valve again ??

Normally, it should cut after the subop adjustment, but it has a different method.