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Problem installing air intake rubbers

Discussion in 'The Garage' started by Kutay, Dec 27, 2023.

  1. Kutay

    Kutay XS400 Member

    Hello, I am working on ym XS400 just like a lot people here. I already rebuilt the mechanical parts twice, it was a dead bike and I am trying to revive it. It is now running, whoop whoop. I am stuck on a small maybe funny problem. I cant get the rubber parts that connect the carburetor to the air filter boxes. The external diameter of the rubber piece seems to the external diameter of the carbs. Being old rubber is is also not very strechy. I am wondering if you have any tips, maybe replacement online. I know there are old ones being sold, I am worried it will be hard rubber as well. Are there different diameter intake rubbers that look the same? would you recommend 3D printing a conversion cylinder? Any advice is welcome. Attached is the intake rubber. I took the image from online, it is the same part i am referring to.
    [​IMG]
     
  2. gpounce32768

    gpounce32768 XS400 Enthusiast

    I've had good luck by carefully heating the rubber/plastic with a heat gun, generally spreading the heat around to soften the material. Don't push it, just enough heat to soften it so it can be slipped over the carb inlets and so on.
     
  3. Kutay

    Kutay XS400 Member

    So not too much pressure. Aim is to get it to be pliable and soft?
     
  4. gpounce32768

    gpounce32768 XS400 Enthusiast

    Yes- soft enough to be flexible but not enough to start it bubbling or charring. Basically not much more than hot to the touch.. don't use a torch it puts in too much heat; a paint stripping heat gun gives a jet of hot air that you can control much better.
     
  5. Kutay

    Kutay XS400 Member

    I found rubber bits used for car carburetors. They go from 55mm inner diameter to 45mm. The external diameter of the filters is 46mm. I think 1mm strecht with bew rubber should be possible. There was no luck woth the crusty hardened rubbers i already had.
     
  6. clawhamm3r

    clawhamm3r XS400 Member

    Is it the original rubber H pipe? I believe I've read somewhere that there are different size H pipes.
     
  7. Kutay

    Kutay XS400 Member

    Yes, thats what I mean. Didnt know about the different sizes.
     
  8. Kutay

    Kutay XS400 Member

    The rubber connectors were too short. I will extend it a little bit with a 3rd printer adapter. I also need to pull them down because of my electronics tray
     

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