If you don't hear the valves rattling, don't touch them. In fact don't touch anything that is not broken, except oil change and chain lube and maybe air filter check.
Our bikes like any petrol that burns. The only thing is that when you constantly use leaded fuel, theoretically the valve clearance gets bigger, because lead forms a layer between the valve discs and the seats.
But again, don't worry about it!
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Fred, XTZ660, Holland.
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Fred, XTZ660, Holland.
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