Breather drain

[Speedy1959]

Hi All,

I noticed when replacing the swing arm that there is a thick breather pipe that has a bung in the end of it.
When I removed the bung, about a table spoon of dirty water came out (Yes I am sure it was water and not petrol or oil)..

What I would like to know is, why have a bung in a breather pipe?
Whats to stop me leaving the pipe open so it can breath naturally when it needs to?

Your thoughts please...

[shanered6]

It sounds like the drain plug for the air box the idea is you let any moister build up out after washing or wet weather and then replace the plug as you dont want to suck anything back in .

[gsxbarmy]

As shanered6 says - it's so you can drain any condensation etc out of the air box, but stop any water etc being sucked up when riding the bike in wet weather (as when running the pipe needs to be sealed so the only air coming in is via the air filter itself.

[KiwiCol]

How do you get water inside the airbox without it having come through the filter?   Must check mine as I've never done it. Mind you, possibly not as much rain here as you northern folk get. 

[seth]

The engine breather also vents to the airbox so any condensation from the motor also goes to the airbox .
As said I wouldn't leave it open just check and drain it once a year or whenever you remember.

[KiwiCol]

I'll try & remember next time it (they) get a wee service. 

[Speedy1959]

Once again.
Thank you all for your knowledge,  intellect and overall superiority of all things GSX..
Now that I have made you all nauseous. ...

Lol

[grog]

mine gets a bit of water in it. just drain every so often. not something that concerns me.

[Speedy1959]

Thank you Mr Grog....
Will leave it alone and drain every blue moon as advised.

S.

[KiwiCol]

If it's got in through the filter Speedy, might be ok to use in a wee Gin?

[gsxbarmy]

How do you get water inside the airbox without it having come through the filter?   Must check mine as I've never done it. Mind you, possibly not as much rain here as you northern folk get. 

Condensation from changing temperatures, esp if bike left outside, plus venting from the engine breather as Seth says.

[lloydjames]

I imagine the bung is to stop any oil or undesirable oil/water mix ending up on your rear tire in the event of something catastrophic going wrong. As has been mentioned, the engine breather can vent here. If you overfill your oil then this is where i imagine the excess will go.

[Basil Brush]

I'll go against the grain here - I took my bung off.

I have vivid memories in the early 80's. Honda CBX550. Coming across this same styled bung. Inquisitive as you are. Pipe was rammed full to the top after about three months of ownership...

[Hooli]

The bung leads to the airbox after the air filter. If you leave the bung out you might as well throw the air filter away too as you're allowing unfiltered air into the engine.

[gsxbarmy]

The bung leads to the airbox after the air filter. If you leave the bung out you might as well through the air filter away too as you're allowing unfiltered air into the engine.

Well pointed out and spot on Andy, totally agree