Quote:
Originally Posted by SV650rules
Having the clearance widen as the engine warms up is proper counter-intuitive unless the valve stem material has negative coefficient of expansion, or the expansion of aluminium head pushes the camshaft away from the valves.
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I think it's probably the latter, as the head is a big casting. As mentioned, I've no experience of this myself, but that's what a couple of owners on SVRider have reported.