From prior experience ( Triumph BSA, Norton etc.) it is a good idea not
to "crank" them plugs down way too tight----

The threads will pull out of the plug holes, or the damn things will run
out with the plugs the next time you pull them out---

Anti seize is a must in any situation where steel meets
aluminum---period--

 Run the plugs down by hand, with the plug in a socket, put the rachet
on the socket and you'll feel the plug make contact-- and just snug
them----and stop---done.

This is the only way--- to assure them coming out without backing the
threads out too----

It also doesn't make one tinker's damn if the plugs are black annodized
or zinc chromated, or just bright zinc---they all are mild steel, and
will all lock up in the hole if not properly istalled---

You have no idea of how many heli coils I have installed in the heads of
old English bikes because some stroke decided to be Arnold Swartznager
in the installation process--not necessary--

Later,

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Terry--

       "Zoom, Zoom, Zoom"
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http://community.webtv.net/CTONLINE/TerrysHighOnLife