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Message: <blockquote data-quote="thomasr" data-source="post: 448565" data-attributes="member: 21998"><p>I recently purchased a 1988 Mercury 20 HP.  I ordered a carb rebuild kit, spark plugs and a couple other items.  The old plugs that were in it were NGK BUHW which are a surface gap type plug.  As per the Mercury Bulletin 91-36 I ordered NGK BP8H-N-10 but these are the conventional spark plug with the electrode.  I want to trust the Mercury bulletin but at the same time I want to NOT bust the top of a piston on a too long spark plug.  Just looking for a little assurance I got the right animal.  Thanks.</p></blockquote><p></p>