1. That screw is the low speed, or idle screw. Set it
about one thread out from flush. I loaned that carb to
a guy awhile back and he thought the
screw was a little loose....so he CA glued it in place.
(thanks alot) I had to soak it in acetone for almost
a week....but did finally get it out....that's why it looks
so thrashed.

2. That screw is the throttle stop adjustment....and
also holds the carb barrel in place....as you found out.

3. Upper and lower needle valve could have been
someones reference to the high speed, or main needle
valve (upper), and the low speed or idle needle (lower).

4. Give the main needle 2 1/2 to 3 turns out for starters.

By the way, that engine is not a dog....it's a very powerful
engine to be sure. When you get it running right you will
be suprised....it will really crank. I've been running those
motors for 30 years, and they are one of my all time
favorites.

If you can....run 15% Powermaster fuel, and a Fox Miracle
plug in it. In any case make sure the fuel blend contains
castor.

No problem, Martin....your welcome for the help....that's
what I do.... ....any problems....just yell....

Dave.