Why would the valves vibrate? If they are secure inside the tunnel then there is nothing to make them vibrate. They only vibrate and fatigue when they move closer to the piston and have been forced up and down by the motor when sticking in carbon/oil glue.
I would think the HOT-COLD HOT-COLD HOT-COLD would be worse than the vibration.
Anyway the valves are safer if you always run the bike 9000 rpm + :biggrin:
I take the advice and use English instead of Google.
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