Your good without a lid for sure, just more air flow for you.

 

<div class="FTQUOTE"><begin quote>Originally posted by: Swaie

Okay, now what is this emulsion tube and what does it do, and waht is the importance of vaccum in the air box. I am currently running with out a lid do I need to go and find a lid, or is running with out okay?</end quote></div>

The vacuum in the airbox is for your vacuum actuated slide. it is plumbed into your snorkel. Where the other carbs like a TM45 and Lectrons do not have the diaphragm to run the slide.

 

With my DS when I had the stock carb with the OMR mods it ran best with the snorkel and no airbox.

With the TM45 I like it best with a direct mount filter, others like the snorkel better.

I do 95% trail riding, and just avoid fast water crossings.