Dan,I had similar experience with my EFS2.It would fly the same way.Didn't
make any difference in needle position but could not get it quite rich
enough.I experimented with filter arrangements and eventually got it
right.Air flow appears to be the answer.At least for me and my
installation.Enjoy the posts.Also on my primer I had some fuel leaking
into the engine at idle.Leaky primer.Made it run rich at idle and couldn't
adjust it with idle screw.Put a shutoff valve on primer and now it's good
to go.Tommy W.
