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Help Repairing tears/pinholes in carb diaphragms

Discussion in 'Tech Tips' started by Th3_Huntsman, Jun 14, 2015.

  1. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    @Murdo @maelstrom

    Hey guys

    I've managed to pinch some diaphragms and now have a tiny pinhole in one. Has anyone repaired one before?

    The internet has led me to thinking it can be done. Polyurethane glue and nitrile rubber from disposable gloves seems a possible way.

    Thanks

    Tyson
     
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Sure, it should hold up. Just expect the problem might recur and source a new one at some stage.
     
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    What carbs are they?

    And where did u source that price u quoted?
     
  4. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    NRP in the UK probably have some.
     
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Thats where I was heading :)
     
  6. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    Kiehin cvk D38s only bike that uses them is the zx7r. All my searching I couldn't find replacements as they are all one piece with the slide. The price was from millway spares and was the cheapest
     
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  8. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    Cheers GI and Blair. I'll do a repair and source some second hand carbs.
     
  9. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea still fairly expensive at about $50 but at least they are around if all else fails

    Take a few pics of your repair job

    Some of my FZR ones were patched up .... pretty dodgy though and they were on their last legs anyway

    IMGP1637 (Small).JPG
     
  10. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Super glue and piece cut from a rubber glove.
     
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  11. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    ^^ I thought you'd have to have done it on some of your projects
     
  12. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Correct.
     
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  13. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    Ok guys i finally got around to giving this a shot.

    First up was diaphragm removal.
    11667878_10154013927944863_1730903580_n.jpg
    you can see where this was pinched, (stupid hasty me)
    11657262_10154013927924863_166002684_n.jpg
    Both of these items are from bunnings, the gloves are nitrile so are fuel and heat resistant and thin and very stretchy and flexible.

    Polyurethane glue is solvent resistant and dries flexible.
    11667239_10154013927889863_2062708144_n.jpg
    So i cut a small square and rubbed a fine even layer of glue onto it. the placed it on the pinhole, then repeated as 2 were pinched.
    11652192_10154013927859863_1142536473_n.jpg
    above is my engineering to ensure they dry flat. in 3 hours i will hopefully have airtight diaphragms again.
     
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  14. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    if these dry like this overnight i may be onto a win
    11292011_10154014055634863_1915984577_n.jpg
    11720016_10154014055649863_1589894410_n.jpg
     
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  15. Joker

    Joker See "about me" for contact details. Contributing Member

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    I'd be hitting up wreckers to find another. The last thing you want is fuel to eat away the adhesive and that to end up somewhere in your carby.

    Good effort though...
     
  16. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    oh i will be, just might take awhile. Fuel *shoudn't* eat urethane :)
     
  17. Joker

    Joker See "about me" for contact details. Contributing Member

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  18. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    I also did it on the outside so if it where to come off it at worst will block the choke.
     
  19. Willrcr15

    Willrcr15 Well-Known Member

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    I've been using nitrile gloves for painting & the rubber looks a bit thicker, get them from the auto paint shops.
    Bloody nice work, if it hangs in there, you've saved good money.
    I've got an XS1100, next project, & the carb diaphrams are bad, $150 ea, so i'll be following your lead with them.
     
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