Rich Running Choke
If its staying too rich then the adjustment or pulloff. I don't think I have a screw but bend the linkage instead. If its there It should be on the linkage coming from the vacuum diagpham on the front.
If you don't have a screw then get a book on tuning them since there is supposed to be settings for all this. The choke should be closed with a gap. This gap then can be opened with slop in the linkage. There should be a gap on the pulloff linkage and so on.
Its simple to do it with directions and the proper order of steps done.






