Greetings,

How do you adjust the idle speed on a Merc 40HP, 2 cylinder, 2-stroke?
I adjusted the cable via the barrel nut, but it made no difference in
the idle speed...

There's a threaded rod above the linkage, but I don't want to fiddle
with anything unless I'm sure. This is my first outboard in 30 years
of boating!!

Thanks!