How can you tell if the valves are burnt?

Burnt valves can often be identified through a few key signs: a noticeable decrease in engine performance, rough idling, or misfires. Additionally, inspecting the spark plugs can reveal signs of damage, such as discoloration or excessive wear. A compression test may also show low pressure in one or more cylinders, indicating valve sealing issues. In some cases, a visual inspection of the valves during a disassembly may reveal pitting or a dull appearance, confirming damage.