I've recently acquired a Mk4 Escort fitted with one of these carbs and thought I'd better check everything's setup correctly so earlier I had a go at adjusting the idle mixture with a colortune. The screw I used is the one shown in this diagram, correct?
http://www.gowerlee.dircon.co.uk/TLDMtype.html (6)
The screw will only adjust roughly 2 turns in and out before going stiff and it seems to make absolutely no difference, am I doing something wrong?!

Thanks.

 

I've got problems with mine at the minute, running far too lean! My mixture screw also doesn't seem to do anything, quite irritating!

 

Anyone else have this problem or any ideas what's going on?