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They let fuel through, so you must screw them in to reduce the richness. Take care, don't tighten too much or you may damage the tips. Do a little at a time each side. It would be worth removing them to check the tips are OK, or they will never adjust properly. Take a look in the throat and check the brass squirty tubes are there; they sometimes come out and get eaten by the engine (accelerator pump nozzle and ful-throttle enrichment nozzle). They might feed too much fuel without the restriction or extra height of the nozzle/tube. It's not unusual to get a bit of black smoke when the accelerator pump squirts, but it shouldn't continue, and properly adjusted the fumes should barely be noticeable (about 3% CO correctly adjusted, so don't breathe it in for any length of time!). I suspect there is a more major carb problem than this adjustment to give such poor mpg (per Imperial gallon too). I would expect mid-20mpg even in winter town traffic, and you've got summer, when 30 town and 34 mpg touring would be more normal. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org