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carbs 1800 69

I can never get the SU carbs on my 1800 adjusted right. Sometimes it idles so slow it will barely run. When I adjust the idle adjustment screws so that it idles at 1000 rpm then a minute later it is at 2000 rpm.

Then I adjust it down again and a second later it barely runs. These are the SUs with the two bolt air filters. They have been reshafted which had no effect on the problem. I have taken them apart several times and there is nothing binding or sticking. Any ideas?






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