He's saying the exit side of the breather tube. It "exhausts" the oil mist into the air cleaner.

 

Any vacuum created by the sweeping of the piston assemblies is countered by "umbrella valves" in the rocker boxes- they are one way valves that only allow air/oil mist to push out- and seal themselves with a hint of vacuum. I also have a SandS reed valve breather gear in my evo that operates the same way.

 

both are the same gas? ,,

 

One is the engine breather system- the other is the transmission vent (if i see the picture correctly).

 

Wrong. The second picture is a breather attached to the engine oil cap/dipstick.

 

Thats pretty slick- im still old technology. Thanks for the correction!

 

Amazed how many people don't understand something so simple. The crank case gets pressurized because of combustion gassed getting past the rings (pistons moving up and down is a net zero on pressure and irrelevant). It's vented to the intake so it can be re-burnt inside the cylinder to help with pollution. The vacuum is irrelevant. Venting it to atmosphere is fine (for the bike anyway). Breather systems are valved to help prevent combustible gasses from being pulled into the crankcase.

 

The DK web site has a good explanation (with pics)

 

o gás que sai da tampa do óleo do motor ventilado é o mesmo que sai do filtro de ar?

 

donde' esta' la biblioteca?

sorry but that's all I know, and will really only come in handy if I'm trying to find a Library in Spain