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CB250RS tank on scrambler project - where is the fuel tank breather?

Discussion in 'Honda 250cc Singles' started by maurizio, Dec 25, 2016.

  1. maurizio

    maurizio Member

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    Hi all,
    I am buidling a scramber project based on a BMW F650 Funduro and I have bought a Honda CB250RS tank which is the best shaped piece.
    However I am struggling to figure out where the fuel breather on the CB250RS tank is.
    Below the tank I see only the fuel tap and the fuel cap seems well sealed.
    Someone has any clue where the fuel breather (venting valve) is and could post some pics?
    Thanks and merry xmas.
     
    maurizio, Dec 25, 2016
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  2. gregt

    gregt Well-Known Member Premium Member

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    Many years ago i did an almost equally odd thing and built a roadracer out of a Gilera Nordwest...Using a CB250RS tank also.
    It dropped straight on...

    From memory they breathe through the cap - and well enough that I had no fuel supply problems on the big single.
     
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    gregt, Dec 25, 2016
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  3. brinkcx

    brinkcx Well-Known Member

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    It's in the cap. There should be 2 little holes in the lower end of the cap (inside) and you should see one in the steel part under the black top, just outside the rubber seal for the atmospheric side.
     
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    brinkcx, Dec 25, 2016
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  4. TechHeadFred

    TechHeadFred Well-Known Member

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    Hi Maurizio, it's definitely in the fuel cap as others have advised.

    Here's some pics of one of my CB250RS fuel caps.

    [​IMG]

    You can clearly see the holes in the bottom , despite some surface rust.

    [​IMG]
     
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    TechHeadFred, Dec 27, 2016
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