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Message: <blockquote data-quote="JL8Jeff" data-source="post: 482604" data-attributes="member: 12995"><p>I wonder if it's a timing issue or the oil pump going bad.  It was belching a lot of smoke when it idled down and that makes me think the vro oil pump is bad.  I had a Merc 90 like that on an old Wahoo I had and it had the typical Mercury "sneeze" that took some idle air screw adjustments to get rid of.  I just remember that the number of turns in the Mercury manual did not work on that motor, I had to go either 1/4 or 1/2 more or less than it called for but I can't remember which.  You may want to start by disconnecting the vro oil pump and running some premix through to see if it idles better, that looked really smoky.  I actually removed the oil pump from my current 64/45 and I've been running premix with Quicksilver synthetic the past 4-5 years.</p></blockquote><p></p>