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Thread: GN250 brake cylinder sight glass has dissolved - repairable?

  1. #1
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    27th December 2006 - 17:17
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    GN250 brake cylinder sight glass has dissolved - repairable?

    Hi

    My son's girlfriend's Jap 2004 GN250 master front brake cylinder sight glass is dissolving, allowing fluid to seep through it. The mechanism is faultless in all other ways.

    Can the sight glass be replaced? Alternatively does anyone have any leads on secondhand cylinders, with or without the brake handle etc?

    Thanks in advance!

    Matt

  2. #2
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    4th April 2011 - 18:44
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    Get in touch with a motorcycle wrecker, they may have one available:

    http://www.motorcyclewrecker.co.nz/

  3. #3
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    Quote Originally Posted by Matt_TG View Post
    Hi

    My son's girlfriend's Jap 2004 GN250 master front brake cylinder sight glass is dissolving, allowing fluid to seep through it. The mechanism is faultless in all other ways.

    Can the sight glass be replaced? Alternatively does anyone have any leads on secondhand cylinders, with or without the brake handle etc?

    Thanks in advance!

    Matt
    As long as the reservoir is FULL and does not leak ... how much you can see IN IT ... is irrelevant.



    Regular checks to ensure it IS full is only required. If it works ... don't fuck with it.
    When life throws you a curve ... Lean into it ...

  4. #4
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    27th December 2006 - 17:17
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    The problem is that it's turned to jelly, the fluid is leaking through it ... worse case would be to glue something over the hole for now.

    Will be trying wreckers tomorrow.

    Thanks guys.

  5. #5
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    17th July 2005 - 22:28
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    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
    Bling your bike out!
    PM me

  6. #6
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    Quote Originally Posted by ducatilover View Post
    ...Easy as.
    Faaaaaaaaar - that's cheap. I guess that's the benefit of owning such a common/popular bike.

    WELLINGTON: Tag-o-rama

  7. #7
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    Quote Originally Posted by rustyrobot View Post
    Faaaaaaaaar - that's cheap. I guess that's the benefit of owning such a common/popular bike.
    Yeah anything for them is cheap.
    Mine has a Chinese master on it and it seems to work as poorly as any other GN
    Actually, the whole front brake system on mine is Chinese from Aliexpress and hasn't fagged out
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
    Bling your bike out!
    PM me

  8. #8
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    7th December 2007 - 12:09
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    Somebody on here posted recently about similar problem.....he somehow glued new glass in......

    but couldn't you just seal it of with bolt and nut...?
    And some synthetic washers up to the task....?

    Who needs sightglass...?
    Opinions are like arseholes: Everybody has got one, but that doesn't mean you got to air it in public all the time....

  9. #9
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    27th December 2006 - 17:17
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    Was quoted $170 today from Boyd in Hamilton, quite liking the bolt, washer, seal and nut idea for a quick fix! Will be hitting up good old Ali Express.

    Thanks guys!

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