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Showing results for tags 'fast idle screw'.
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Hi all, I have a '74 260z with a 280 engine/5-sp manual that I purchased a few months ago. In the early 80's, a triple carb system was installed in it. Then around 2010, it was changed back to a dual SU carb system. I was trying to adjust the carburetors and could not locate the fast idle screw. After some digging on the internet, I think it's missing (see second picture), maybe during the switch back to dual carbs and the addition of the nifty bolt as a vacuum plug. Is this something I can easily fabricate out of a triangle of thick sheet metal with three holes, a screw for adjusting and maybe a spring around the screw? If not, anyone can suggest a source for this missing part? Also while I'm at it... The first picture is of the bottom of one of the carbs. Is the knurled nut just below the carb the air/fuel ratio adjuster? Thanks! Jeff