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Assume you're talking about the tiny snap ring that retains the main jet needle in the slide. There are 3 grooves in the top of the needle, stock position is the middle groove; top groove (lowering the needle) is leaner; bottom groove (raising the needle) is richer.
If you have any doubt about the hoses/lines, just replace them. If not, you can bet they will fail at the most inopportune time.
Good luck!
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2003 AC F5 (Jr's Dec 07 SOTM & 2008 SOTY)
2003 AC F7 EFI SP (April 06 SOTM)
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