Xr650L breather hose?

Does anybody know what is the purpose for the hose that routes on the right side of the carb through a clip on the top of the carb and is left unhooked? :applause:

If im not mistaken it's a vacuum hose.

It's a breather/vent hose. It is routed down through the "O" clip holder and stays pointed down, but open. It's the hose with a harder plastic collar about 1/2 inch long that stops it from being pulled down too tight.

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