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Why you should replace butterfly (throttle shaft) seals.

Discussion in 'XJ Technical Chat' started by Jetfixer, May 12, 2019.

  1. Ryengoth

    Ryengoth Active Member

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    I had no issues fitting viton o-rings in my rebuilds. The V seals are available but they are overpriced and only do a slightly better job at sealing. They do a much better job of splitting than the o-rings do, though.
     
  2. Jetfixer

    Jetfixer Well-Known Member

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    Sometimes it is best to order the best cry once. In other words do the job right the first time , and KMOE is spot on get the CORRECT fuel rail seals , you do not want a leak at these points can lead to a fire.
     
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  3. Nick S

    Nick S Member

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    @Jetfixer does anyone know the correct size for the fuel rail o-rings?
     
  4. Huntchuks

    Huntchuks Well-Known Member

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    #10 fit the Hitachi's on the XJ700.
     
  5. Nick S

    Nick S Member

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    My fault, should've started with for an '82 xj650 maxim. The carb for that one is a hitachi HSC32
     
  6. Polock

    Polock Well-Known Member

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    WARNING, REDNECK FIX
    i found a o-ring that fit tight in the groove on the fuel pipe but didn't quite go into the carb. then i pushed harder, then really dam hard and it went in, and cut a little sliver of o-ring off as it did
    they haven't leaked in years.
    i don't recommend this, but i can't argue with success.
    your really better off with the real ones
     
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  7. Jetfixer

    Jetfixer Well-Known Member

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    Xj4ever has the correct seals , although they look like "O" rings they are flat on the outside and when you put the rail into the body you will feel a slight snap that locks them in place. My local Yamaha dealer actually had them as well. I can't recall price .
     
  8. ddiggerr

    ddiggerr New Member

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    wow ... I just broke down the carbs and replaced the throttle shaft seals with #11 rings. It worked good for about 10 minutes, then hung up and had to shut it down to get throttle to snap back. I used silicone on rings on reassembly but now I am thinking I will have to break down carbs again to see whats hanging up. I cannot sync carbs in this condition
     
  9. Polock

    Polock Well-Known Member

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    am i the only one who did the o-rings successfully?
     
  10. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Did you work the throttle linkage to "bed" the o-rings in before you installed the carbs?

    I know that others have. I uesd o-rings on my friends Virago without any trouble.
     
  11. XJ550H

    XJ550H Well-Known Member Premium Member

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    silicon paste not spray for the o rings
     
  12. ddiggerr

    ddiggerr New Member

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    Yes. But not sure how long I should have worked at it. The butterflies seem to snap shut quite easily before installing carbs. However, after everything heated up they seems to just gum up and hold at 4000rpm. I used 2 #11 rings on ech side of carb and applied silicone grease to all of them and the shaft. Maybe the silicone was crap.
     
  13. Polock

    Polock Well-Known Member

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    when the carbs are assembled into a rack they can get twisted and bind up, maybe that's all that's wrong
    or they are trying to close and the sync is off, that could easily get you 4K
     
  14. ddiggerr

    ddiggerr New Member

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    I am going to lean towards the twisted rack. I used a 1/2" piece of plexi to keep them straight, but could have missaligned them.

    Time to pull them out again. Fun times
     
  15. ddiggerr

    ddiggerr New Member

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    20200705_191807[1].jpg its not twisted .... (ignore the numbering sequence on the rack)

    I also re did the bench sync to where the butterflies are set to only show the slightest edge of the first hole
    20200705_191945[1].jpg

    I took video of butterflies closing, but couldn't get it loaded. There still not closing as fast as they should be. They almost seem to be hanging just before seating
     
  16. Huntchuks

    Huntchuks Well-Known Member

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    I originally used one #11 X ring and one stretched #10 O ring per side but found the two rings together slowed the close of the butterflies. Removed the O rings and all is well. It might be the total width of the two rings make for a slightly tight fit. The original seals are not any wider than one X ring anyway.
     
  17. Polock

    Polock Well-Known Member

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    the butterflys might be rubbing on the sides of the bore.
    i had the linkage hang up on a manifold clamp at about 3/4 throttle one time, glad i found that before the first red light :)
     
  18. Jetfixer

    Jetfixer Well-Known Member

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    Did you use Vitron O rings?
     
  19. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Who made the o-rings? Go too cheap and they won't consistantly be to spec. If the diameter of the core is just a tad too big, then the ID and OD will be off.
     
  20. Polock

    Polock Well-Known Member

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    i wouldn't expect a #11 X and a #10 O to work, the OX would fit more like oX
    i never tried Viton, if the Buna-n ever fail i might
    we have thrown out harbor freight orings, some places they work fine but not always
     
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