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External
Since: Aug 09, 2003
Posts: 4
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(Msg. 1) Posted: Sat Aug 09, 2003 6:25 am
Post subject: Keihin CV's air cut-off valve
Archived from groups: rec>motorcycles>tech (more info?)
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Does anyone know what the function of this diaphragm/valve is? There is one
per carb, on the side and I would need to seperate the carbs to check # 2,
3, 4. If----I knew what they did I could determine if they were working
properly without having to go to all the additional time and expense to
visually inspect them. I have the carbs off to check float height, jets,
needles, screws etc,. while seeking to correct a mid throttle lean
condition. I have the factory Homda manual and they don't mention it. (1979
Honda 750 LTD). I want to get the machine on the road.
Thanks. Jake |
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External
Since: Jun 27, 2003
Posts: 63
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(Msg. 2) Posted: Sat Aug 09, 2003 2:24 pm
Post subject: For SAKE!! Holiday plans etc [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Jake wrote:
> Does anyone know what the function of this diaphragm/valve is?
Summarized from the Honda Common Service Manual (the part number on
mine, an old copy, is 61CM000):
When the throttle is being closed and engine braking applied, the
fuel mixture leans out, and backfiring may occur. To prevent
this, the air cut-off valve closes the air passage to the slow jet
and temporarily richens the mixture. With the throttle closed
and vacuum in the main bore increasess, the diaphragm in the air
cut-off valve closes the air passage. A decrease in vacuum then
re-opens the passage.
--
Dan Carter, San Luis Obispo, CA |
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External
Since: Jun 29, 2003
Posts: 3
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(Msg. 3) Posted: Sat Aug 09, 2003 6:47 pm
Post subject: For SAKE!! Holiday plans etc [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Thanks Dan!
That is good news because I do not see how that valve could contribute to my
"leaness". So I will not seperate the carbs which required removing the
staked screws retaining the choke butterflies to the common shaft. I have
quite a collection of service manuals but none addressing/describing this
valve. Thank you for taking the time to help out a fellow wrench.
Jake.
"Dan Carter" wrote in message
> Jake wrote:
>
> > Does anyone know what the function of this diaphragm/valve is?
>
> Summarized from the Honda Common Service Manual (the part number on
> mine, an old copy, is 61CM000):
>
> When the throttle is being closed and engine braking applied, the
> fuel mixture leans out, and backfiring may occur. To prevent
> this, the air cut-off valve closes the air passage to the slow jet
> and temporarily richens the mixture. With the throttle closed
> and vacuum in the main bore increasess, the diaphragm in the air
> cut-off valve closes the air passage. A decrease in vacuum then
> re-opens the passage.
>
> --
> Dan Carter, San Luis Obispo, CA >> Stay informed about: Keihin CV's air cut-off valve |
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External
Since: Jun 18, 2003
Posts: 18
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(Msg. 4) Posted: Mon Aug 11, 2003 12:40 am
Post subject: For SAKE!! Holiday plans etc [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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> Thanks Dan!
> That is good news because I do not see how that valve could contribute to
my
> "leaness". So I will not seperate the carbs which required removing the
> staked screws retaining the choke butterflies to the common shaft. I have
> quite a collection of service manuals but none addressing/describing this
> valve. Thank you for taking the time to help out a fellow wrench.
>
> Jake.
If the diaphragms have holes in them could that cause a vacuum leak? Could
it prevent the slides from opening all the way?
> >
> > > Does anyone know what the function of this diaphragm/valve is?
> >
> > Summarized from the Honda Common Service Manual (the part number on
> > mine, an old copy, is 61CM000):
> >
> > When the throttle is being closed and engine braking applied, the
> > fuel mixture leans out, and backfiring may occur. To prevent
> > this, the air cut-off valve closes the air passage to the slow jet
> > and temporarily richens the mixture. With the throttle closed
> > and vacuum in the main bore increasess, the diaphragm in the air
> > cut-off valve closes the air passage. A decrease in vacuum then
> > re-opens the passage.
> >
> > --
> > Dan Carter, San Luis Obispo, CA
>
> >> Stay informed about: Keihin CV's air cut-off valve |
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External
Since: Aug 09, 2003
Posts: 4
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(Msg. 5) Posted: Wed Aug 13, 2003 6:39 am
Post subject: For SAKE!! Holiday plans etc [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Bret Taylor" wrote in message
> > Thanks Dan!
> > That is good news because I do not see how that valve could contribute
to
> my
> > "leaness". So I will not seperate the carbs which required removing the
> > staked screws retaining the choke butterflies to the common shaft. I
have
> > quite a collection of service manuals but none addressing/describing
this
> > valve. Thank you for taking the time to help out a fellow wrench.
> >
> > Jake.
>
> If the diaphragms have holes in them could that cause a vacuum leak? Could
> it prevent the slides from opening all the way?
>
> Bret, I'm not real sure how the diaphragm receives it's 2 pressure
signals, but the machine runs good at idle when vacuum is fairly high, so
I'm thinking the diaphragms are intact.
Let you know soon,
Jake.
> > >
> > > > Does anyone know what the function of this diaphragm/valve is?
> > >
> > > Summarized from the Honda Common Service Manual (the part number on
> > > mine, an old copy, is 61CM000):
> > >
> > > When the throttle is being closed and engine braking applied, the
> > > fuel mixture leans out, and backfiring may occur. To prevent
> > > this, the air cut-off valve closes the air passage to the slow jet
> > > and temporarily richens the mixture. With the throttle closed
> > > and vacuum in the main bore increasess, the diaphragm in the air
> > > cut-off valve closes the air passage. A decrease in vacuum then
> > > re-opens the passage.
> > >
> > > --
> > > Dan Carter, San Luis Obispo, CA
> >
> >
>
> >> Stay informed about: Keihin CV's air cut-off valve |
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