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Quick carb question xs500

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Jay2903
Scooby Slapper



Joined: 03 May 2016
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PostPosted: 16:23 - 01 Sep 2017    Post subject: Quick carb question xs500 Reply with quote
I just finished fitting all the bits from 2 carb rebuild kits to the carbs on my xs500. I put a vacuum on one side of the carbs but when I push the throttle arm the sides don't rise.

Do they have to be filled with fuel or does this test just not work on these carbs ?

(Keihin carbs) [/list]
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Tankie
Crazy Courier



Joined: 24 Feb 2017
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PostPosted: 16:36 - 01 Sep 2017    Post subject: Reply with quote
If you have used pattern part kits for the rebuild your probably opening a can of worms.
I don't know the carbs ,but if they are C.V carbs the slides are lifted by air pressure when the engine is running
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Jay2903
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PostPosted: 18:12 - 01 Sep 2017    Post subject: Reply with quote
https://i61.photobucket.com/albums/h67/Jay29031/Mobile%20Uploads/51C412F0-B5D2-4C5D-8535-6DA627894650_zpsyvhlk3cs.jpeg

I was wondering if a bad seal between parts 97 and 98 would cause this ?
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Jay2903
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PostPosted: 18:13 - 01 Sep 2017    Post subject: Reply with quote
Tankie wrote:

I don't know the carbs ,but if they are C.V carbs the slides are lifted by air pressure when the engine is running


That's what I'd assumed
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A100man
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Joined: 19 Aug 2013
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PostPosted: 07:46 - 02 Sep 2017    Post subject: Re: Quick carb question xs500 Reply with quote
Jay2903 wrote:
I just finished fitting all the bits from 2 carb rebuild kits to the carbs on my xs500. I put a vacuum on one side of the carbs but when I push the throttle arm the sides don't rise.

Do they have to be filled with fuel or does this test just not work on these carbs ?

(Keihin carbs) [/list]


Do the slides lift easily by hand (finger)? A bent needle will impede motion. Also damaged diaphragm on a cv (I think)..
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temeluchus
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Joined: 01 Oct 2008
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PostPosted: 09:33 - 02 Sep 2017    Post subject: Reply with quote
Attach a photo on bcf as your photobucket has run out.

How are you 'attaching' a vacuum?

Provided the diaphragms are not torn and are not perished, and the slides move with firm push of a finger, it should be fine.
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Jay2903
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Joined: 03 May 2016
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PostPosted: 13:43 - 02 Sep 2017    Post subject: Reply with quote
temeluchus wrote:
Attach a photo on bcf as your photobucket has run out.

How are you 'attaching' a vacuum?

Provided the diaphragms are not torn and are not perished, and the slides move with firm push of a finger, it should be fine.


Yea they move fine. (Steel diaphragms). I attached the vacuum the same on a spare set of carbs and they moved up and down normally.

Last edited by Jay2903 on 13:47 - 02 Sep 2017; edited 1 time in total
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Jay2903
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PostPosted: 13:44 - 02 Sep 2017    Post subject: Re: Quick carb question xs500 Reply with quote
A100man wrote:
Jay2903 wrote:
I just finished fitting all the bits from 2 carb rebuild kits to the carbs on my xs500. I put a vacuum on one side of the carbs but when I push the throttle arm the sides don't rise.

Do they have to be filled with fuel or does this test just not work on these carbs ?

(Keihin carbs) [/list]


Do the slides lift easily by hand (finger)? A bent needle will impede motion. Also damaged diaphragm on a cv (I think)..


Needles are new, steel diaphragm. They move fine
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Jay2903
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PostPosted: 13:45 - 02 Sep 2017    Post subject: Reply with quote
I thought maybe a bad seal between 97 and 98 ?
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