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CV Carbs?

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JackButler
Trackday Trickster



Joined: 11 Nov 2019
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PostPosted: 14:20 - 01 Dec 2019    Post subject: CV Carbs? Reply with quote

On CV carbs, is the diaphragm or the spring more important???

Diaphragms look in good condition but with a crude airflow setup they seem to lift at different rates.
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Robby
Dirty Old Man



Joined: 16 May 2002
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PostPosted: 15:15 - 01 Dec 2019    Post subject: Reply with quote

Both should match, and the slides should lift at the same rate. Are they moving smoothly in the bores?

Also, a crude setup will give crude results. A better test would be to apply a measured amount of vacuum above the slide of each one and see if they all lift the same.
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JackButler
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PostPosted: 16:48 - 01 Dec 2019    Post subject: Reply with quote

Robby wrote:
Both should match, and the slides should lift at the same rate. Are they moving smoothly in the bores?

Also, a crude setup will give crude results. A better test would be to apply a measured amount of vacuum above the slide of each one and see if they all lift the same.


Yeah but, how do you do that?

I think my crude setup is giving them 15psi to each carb at the same time yet they open at slightly different times.

I haven't yet done a test on the springs, I'm guessing that with a certain weight on each spring they should all ber the same length yes?
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Robby
Dirty Old Man



Joined: 16 May 2002
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PostPosted: 17:18 - 01 Dec 2019    Post subject: Reply with quote

JackButler wrote:


Yeah but, how do you do that?


Personally, I don't. If you're chasing a problem, it isn't down to the CV slides as long as the diaphragms aren't holed.
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bikenut
World Chat Champion



Joined: 21 Nov 2011
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PostPosted: 11:22 - 02 Dec 2019    Post subject: cv Reply with quote

or stiff etc.....
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steve the grease
Trackday Trickster



Joined: 26 Jan 2018
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PostPosted: 01:36 - 03 Dec 2019    Post subject: Reply with quote

I know they are long large and very soft springs , but you should be able to rig something up like this ~~ is the spring obviously. I is like a big washer or something to support the springs.

ViceI ~~I~~IVice. And then tighten it up.

Vice could be a vice or one of those long furniture clamps
if the springs are the same rate the middle I will be the same distance from each of the other I's . If the springs are not the same rate the softer one will compress faster and so the distance between the I's won't be the same, the shorter side being the softer spring.
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JackButler
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Joined: 11 Nov 2019
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PostPosted: 16:04 - 03 Dec 2019    Post subject: Reply with quote

mpd72 wrote:
I'm in the process of changing the carb to inlet manifold rubbers and inlet manifold gaskets on my YZR750R to cure a suspected air leak. The slides on the carbs aren't lifting in synch on that at the moment, even though the diaphragms look OK.

Are the intakes OK?


Intakes are fine. I'm resigned to thinking that CV carbs just don't open uniformly, which explains a lot . . .

I need to do a lot more carbs, maybe then I'll learn the limits between Ok & not so OK.
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“And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.”
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