tcslr Posted July 5, 2019 Share Posted July 5, 2019 This photo shows the Carter BB1 main meter adjustment. Rather than a screw, it is a 1/2" nut. Has anyone ever seen this before? why a nut and not a screw? Does adjustment operate the same? Link to comment Share on other sites More sharing options...
oldford Posted July 5, 2019 Share Posted July 5, 2019 It might just be a plug that someone put in covering a fixed jet. Frank Link to comment Share on other sites More sharing options...
nickelroadster Posted July 6, 2019 Share Posted July 6, 2019 Not all BB-1s had adjustable mixture. Link to comment Share on other sites More sharing options...
stakeside Posted July 8, 2019 Share Posted July 8, 2019 This is a metered carb. This is a adjustable carb. Link to comment Share on other sites More sharing options...
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