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Crankase breather hose or something else ?

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  • Crankase breather hose or something else ?

    I have a 2stroke yamaha model 30DEO.
    6J8K - L - 1003853
    6J8-D0 Model 2004

    What is the purpose of the hose in the picture below (part number included) and is the term "Crankcase breather hose" the correct one ?

    Thank you.
    Last edited by gvp90000; 1 week ago.

  • #2
    I don't see it listed as a crankcase breather hose. Yamaha lists it as just a hose.

    When I think of a crank case breather hose I think of a four stroke.

    My guess is that it is an oil recirculation hose.

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    • #3
      or crankcase recirculation .
      I believe it recirculates liquid oil/fuel that settles out at the bottom of each crankcase section that does not make it into the combustion chamber to burn it
      should have a check valve involved

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