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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Breathers (crankcase breathing system) » White Substance Coming from breather tubes « Previous Next »

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Brando
Posted on Friday, April 13, 2007 - 06:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey, Just bought my first Buell, and was riding the other day and I noticed a white foam coming out of the discharge side of the breather tubes, Anyone have any idea what this is?
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Tim
Posted on Friday, April 13, 2007 - 07:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yes,it is an oil/water vapor mixture that comes out of the breathers. It is also referred to as "puke" as in " my breathers are puking".

In a stock set-up this get routed back into the intake before it condenses. Most people have rerouted the lines into a "catch-can".

Catch-cans can be anything from a plastic bottle to a billet aluminum piece of art.
You should be able to use the search function to find many examples.

Some have went with the XB rocker box covers, which have a traditional PCV valves located on the top of the cover.
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Paolo
Posted on Wednesday, May 23, 2007 - 04:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

While installing a catch can, I noticed that the breather hoses smelled gasoline. Is this normal?
My bike (12R -05) runs currently like shit (missfires a lot).
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Reepicheep
Posted on Wednesday, May 23, 2007 - 08:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I usually smell some gas in there, but it smells more like half burnt gas then pure gas.

Regardless, the bike should not be misfiring.
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