Small Engines (Lawn Mowers, etc.): 12 HP B&S carb. screw settings, tweak screws, briggs and stratton


Question
Which of the two is the idle screw?
-------------------------------------------
The text above is a follow-up to ...

-----Question-----
I have a 12HP Briggs and Stratton engine in a Weedeater riding mower, model 282707, type 0167 01. There are two screws on the carburetor, where are they supposed to be positioned? I think they have been turned. I was wondering if there's a setting for them (perhaps, screw all the way down and then unscrew a turn and a half, something to that nature, something I can do myself). I don't know too much about engines, but I know the mower started before the screws were turned. Thanks, Jamie
-----Answer-----
you are no track.  1 and 1/2 turns out from bottom.  idle screw as needed.  if its getting fuel and fire it should run.
tweak screws slightly  after it is running.   mainly giving fuel needle a little more or less.

Answer
there is 3 screws.  the idle is the small one up top of carb. with spring on it that goes against the thottle shaft.
the small of the 2 you are thinging of > and should be on side of carb.  is the air mixture.  the one on bottom of carb. is the fuel mixture.
i hope this helps