Need help with adjsuting the carb on my wives savage.  I have read thru the "Carb" topics and still need a little help.  After changing to an Iridium plug the backfiring on shut down is very bad (and loud).  I went to an Iridium plug as she was having a hard time starting and I must say this new plug does make a difference.  With the new plug it did backfire on shutdown, but is has since gotten louder when I did the spacer mod.  What I have done so far:  I replaced the white spacer with 2 washers (half the thickness of the white  spacer).  I first tried it on the Middle grove on the Jet needle (it has 3 grooves) and later switched it to the lower groove, both with the same results, loud backfiring on shutdown.  Afetr reading the forum, it mentions the the idle mixture screw.  I want to try playing with it, but first need to find it.  I can't find any pics pointing it out.  Question on where it is.  I see a small (about 1/8 to 1/4 in across) on the left side just behind and up a bit from the choke knob, is this it?  This is the only brass plug I can see.  I also have another question, on the right side, just above the E Clip that goes on the end of the Throttle shaft as it comes out the right side, I have a brass slotted screw.  When I took it out, it was a needle with a spring and smaller washer inside, is this the Idle mixture screw (maybe the previous owner drilled it out), when I tighten it all the way in, it only goes flush with the carb body and not inside (to hid a plug).  If it is not the idle mixture screw, what is it and where should it be set (I can't find it in the manual).  Thanks much.  This forum is great, has helped me in the past with many questions

Stoner

Savage Greg posted this.  (many thanks Greg.....)

Yes I am running the Stock muffler.  I will check the header for leaks.  Will also reset the ide mixture screw as I now know where it is now (it is now all the way in). and if need be put back in the spacer and see what all that does. Thanks for the help guys