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Help Would like to seal a pinhole in my CV carb diaphragm

Discussion in 'Maintenance' started by grcamna5, Mar 28, 2022.

  1. grcamna5

    grcamna5 Active Member

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    I have a pin hole in my 83' Suzuki GS750ES(this one isn't 250cc,sorry)Mikuni carb slide diaphragm and wondered if anyone would recommend a strong,flexible sealer to fill it until I can afford a new slide.
    I could possibly use a fine pin to apply it ? thanks :)
     
  2. jmw76

    jmw76 Well-Known Member

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    Never attempted to repair one before. But being rubber, I would start with the glue used to repair punctures in tubed tyres. Just buy a repair kit at a bicycle shop or similar.

    I have used tube repair kits to fix radiator hoses in an emergency before. In fact one of my bikes is still running a patch with no leaks. The hose is now difficult to get.


    Peter.
     
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  3. grcamna5

    grcamna5 Active Member

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    Rubber cement? it's an idea & may be possible;am hoping to see if something is impervious to gasoline.
     
  4. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Thinking that polyurethane that is used to install windscreens might work, a dot on both sides, joined through the pinhole might work
    It's pretty stubborn stuff
     
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  5. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Yeah, I thought that too. It's called Sikaflex.
     
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  6. grcamna5

    grcamna5 Active Member

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    I imagine it cures hard so just a small pinhole amount of it could possibly be tolerated on a flexible rubber diaphragm?
     
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  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  8. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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  9. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  10. iansoady

    iansoady Member

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    If it is literally a pinhole then a tiny drop of superglue should work. Superglue was originally developed for making bespoke O rings so sticks well to rubber. Yes it will reduce flexibility but only very locally.
     
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  11. grcamna5

    grcamna5 Active Member

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    Yes,it's just a small pinhole.
    I think the rest of the diaphragm will flex around it and at least the slide will be sealed;I hope it will stay-put considering the gasoline. thanks,Bill
     
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  12. flea

    flea Well-Known Member Premium Member Contributing Member

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    plastidip works well at least short term also superglue
     
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  13. iansoady

    iansoady Member

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    So, did it work?
     
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  14. DannoXYZ

    DannoXYZ Well-Known Member

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    Personally, I would use aquarium-grade silicone. A little smear on each side so they meet through
    hole should seal and keep repair tight.
     
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