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My son is now riding my 92 Virago 1100 and is becoming a bit casual about periodically checking the valve lash (required every 3600 miles by the book) I have always believed as the valves and seats wore, the valves receded slowly into the head thus decreasing valve lash until the valve no longer closed adequately and it or the seat burned and pitted. He believes the opposite, that the valve train wears (not much of a valve train with an over head cam) that the lash slowly increases thus making the valves noisy and eventually restrict breathing.

Only one of us can be correct, and I don't care which. My main concern is to avoid burning the valves to avoid otherwise unnecessary head work. Can anyone give me a solid answer as to which way valve lash changes over time and mileage on this machine?
 
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