748 Under Seat Expansion Tank

Discussion in '748 / 916 / 996 / 998' started by Mark996, May 27, 2025.

  1. Morning all,

    I’ve noticed that under the seat there’s another opaque plastic expansion tank which appears to have a thick pipe pertruding from it and a) I’m not sure what it is and b) should the outlet pipe have a hose attached to it heading toward the air box??

    cheers.
     
  2. There is a crankcase vapour catch can under the front of the seat. Piped from the crankcase breather valve and catches oil spray. Vapours are directed to the airbox to be burned. tw5855-11-13-ducati-moster-1100-d351-18__23283.jpg
     
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  3. no. It’s not that one I mean…..just out walking dog but when I get back, I’ll post a pic….

    the one I’m talking about looks like the cooling system reservoirs…
     
  4. It’s this one here - two apologies, one I’ve put the seat into back on so it’s harder to see now and two, it’s not opaque at all, it’s black?!

    IMG_2776.jpeg
     
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  5. That's the breather/catch tank as pictured above (picture shows it upside-down), fitted as standard.

    You can also get a larger one that replaces the undertray and fills the underseat area;

    [​IMG]
     
    #5 Dukedesmo, May 27, 2025
    Last edited: May 27, 2025
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  6. Screenshot_20250527_191308_Chrome.jpg

    Screenshot_20250527_191216_Chrome.jpg
     
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  7. Ahhh, so mine IS missing a hose…thanks for that.
     
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