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Message: <blockquote data-quote="JL8Jeff" data-source="post: 473377" data-attributes="member: 12995"><p>Off the top of my head, I think a lot of the Mercurys are best set around 1/4 turn out.  If it's off too much, you can get that Mercury "sneeze" at idle.  It's more like a stumble but it takes some fine adjustment on a warmed up motor while running it in gear.  So you can do an initial set of it while on the trailer but plan on fine tuning on the water.  I think when too much air mixes in, it will cause a lean out and the "sneeze" or stumble.  I've had to adjust a 90 hp and my 60/45 jet and it takes a little while to keep adjusting each one (depending on how many carbs your engine has).  I think as you turn the screw in and there is less air, the mixture is the right ratio which raises the idle until not enough air gets mixed in.</p></blockquote><p></p>