breather oil filler cap

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their just a vent basically that u screw into ur oil filler cap and its ment to make ur bike run a little cooler an take pressure of ur case... i think anyway if anyone knows exactly how they work or even uses one let me know thanks
 
their just a vent basically that u screw into ur oil filler cap and its ment to make ur bike run a little cooler an take pressure of ur case... i think anyway if anyone knows exactly how they work or even uses one let me know thanks

yes, that is how they work.
normaly it will run a braided hose up to a can shaped thing, and also they have a vent coming out of the valve(running a hose to this can) then a single hose out the back to the back of the bike so the fumes and stuff go out the back and dirt and water and bits dont get down the hose

EDIT** and yes i have used one and will be using it on my new bike when its together:)
 
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