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The valves need to be adjusted (or checked) while the engine is cold, in order to ensure that there is a working clearance between the cams and the cam followers when the engine reaches normal operating temperature.
The valve clearances on Triumphs are set by using the appropriate sized shims. Some other engine designs use different methods.
It is not something you should think about doing yourself unless you are sure you know what you are doing.
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"You can't fly with the eagles if you keep scratching with the turkeys."
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