What is the purpose of this screw on my 1991 mercury classic 40hp???
D DareDevilDave Founding Member Founding Member Joined Apr 25, 2015 Posts 154 Likes 47 Points 183 Today at 12:46 PM #1 What is the purpose of this screw on my 1991 mercury classic 40hp???
R Retired-Guy Founding Member Founding Member Joined Oct 5, 2015 Posts 1,150 Likes 269 Points 298 Location Bismarck Today at 1:20 PM #2 Pobably idle speed adjustment.