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· Registered
3,213 Posts
IDK, but I'll guess metal. Read my posts (from this year) about changing mine on the exhaust cam.

A couple of other things to do first, if not done already: check the oil filter mount/cap for a cracked-off end, and clean the two check valves that go in the side/front of the head near the exhaust. And, of course, change the oil and filter.
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