2008 450f fuel screw

I just bought this, I need to adjust the mixture..

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And I'm having trouble installing it...

Do I already have an idle screw?

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The big silver knob to the left of center in your picture is the idle speed screw.

Underneath the carb, in front of the big cap, up in side a tube, is the fuel screw you are about to replace.

Be forwarned, many alloy fuel screws are poorly made (read that 95% of them).

They can require a much smaller pilot jet, the tip can jam and break off in the seat.

I only rec. brass or stainless steel ones.

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