air vent problem

[sean556]

what is this where does it go an how the hells it unplugged, vacuum/airvent? drz400s 01 stock carb

[William1]

It is the vent for the coolant over flow tank.

[OverSquareEng]

That is supposed to be open like that, it is meant to reference atmospheric pressure.

 

Completely normal

[Erik Marquez]

It is the vent for the coolant over flow tank.

It is????

 

 Looks like the carb atmospheric vent hose to me, but the pic is a bit blurry.. 

[Mr-Adventure]

It is????

 

 Looks like the carb atmospheric vent hose to me, but the pic is a bit blurry.. 

That was my guess but as I have never seen an S/SM up close I didn't comment.

This confirms your observation Erik.

#60 https://www.thumpertalk.com/shop/oem/images/Suzuki/2009/Motorcycles/28474_DRZ400SK5E03E28012.gif

[sean556]

What does the carb atmospheric vent do? I can get a better pic when I get outa work

[Erik Marquez]

What does the carb atmospheric vent do? I can get a better pic when I get outa work

That carb, the Mikuni BSR36 is a constant velocity type, ie the slide is actuated by engine vacuum. In order for that to happen, the other side if the slide diaphragm but be open to normal atmospheric pressure. That hose depicted accomplishes that task.

[William1]

It is????

 

 Looks like the carb atmospheric vent hose to me, but the pic is a bit blurry.. 

I only looked at the thumb. Upon a better look with my glasses on... Yup. the cab vent.

[Erik Marquez]

I only looked at the thumb. Upon a better look with my glasses on... Yup. the cab vent.

All good... 

Happens all the time now when i read posts on my phone instead of a 22" LCD computer monitor 

[Brandon.goes]

Hey y’all,

I’m gonna resurrect this thread since I’m still wondering, should this hose connect to anything? Mine looks like there’s a small nipple at the bottom that was broken off when the previous owner dropped the bike. 

[Rhinoracer]

Like all previous answers, no. It remains open so the vacuum slider can operate.

[Brandon.goes]

15 minutes ago, Rhinoracer said:

Like all previous answers, no. It remains open so the vacuum slider can operate.

Okay so then why the broken valve below it? 

Edited June 19, 2020 by Brandon.goes

[Rhinoracer]

Yes you're right. Connect the hose to it.

[DrzDick]

That looks like some kind of filter, does it look aftermarket?

I don't think it needs to be there btw.

[Brandon.goes]

17 minutes ago, DrzDick said:

That looks like some kind of filter, does it look aftermarket?

I don't think it needs to be there btw.

On the TT diagram it's called the (CA) fuel valve, seems like it has something to do with smog restrictions in California. 

It's #4 on the diagram 

https://thumpertalk.com/shop/oem.php?partcategory=787961&manufacturer=5&category=5&year=2002&model=27331

[DrzDick]

Oh yeh, and it does look like a proper bit of OEM kit judging by the bracket.

So it's part of the fuel vapour capture system, it links to the canister, which is normally just a tank with activated charcoal in it and it then vents back through the engine once it's running. Most people (on other bikes) just remove that if it gets damaged or even just of it's taking up storage space.. That is unless they live in CA I guess.

First time I've seen one on a DRZ though.

[ptgarcia]

That's part of the CA smog crap. Just take it off and vent the carb to atmosphere.