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Carter BB1 main meter adjustment

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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?

 

Main meter.jpg

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It might just be a plug that someone put in covering a fixed jet.

 

Frank

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This is a metered carb.

 

46458AAD-7FFB-4101-80F2-22ECB15526E4.thumb.jpeg.decdd040620585f61edf3ae75dd2de0d.jpeg

 

 

This is a adjustable carb.

 

C22802FD-E01F-459E-BB03-7DDB031A931A.thumb.jpeg.c0efaf3aa13100f65d728b251f4095cd.jpeg

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