Subject: Re: [Healeys] HD6 jet adjustment

From: <[email-masked]>
Date: Tue, 6 Aug 2024 10:36:41 -0700

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Simon - do you have HS-4s as fitted, or HD-6s?  my first thought is I never
had to center the jets on my tri-carb, so I'm not entirely sure whether it
can be done on the car. 

A first thought would be to wonder how all three jets would have gotten out
of alignment? I would check the needles for alignment and wear first, before
digging into the jets.

-----------------------------------

All the best,

Al Fuller

From: Healeys <[email-masked]> On Behalf Of Simon Lachlan
via Healeys
Sent: Monday, August 5, 2024 7:09 AM
To: Healeys <[email-masked]>
Subject: [Healeys] HD6 jet adjustment

I'm told that the jets on my HD6s are not quite correctly centred. The
pistons do not fall fast enough nor with a satisfactory "click". I have
three of them in my MkII BT7. Do I have to take the carbs out or can it be
done in situ? Not a lot of room....

Simon

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link=3D"#467886" vlink=3D"#96607D" style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Simon &#8211; do you have HS-4s as fitted, or =
HD-6s?&nbsp; my first thought is I never had to center the jets on my =
tri-carb, so I&#8217;m not entirely sure whether it can be done on the =
car. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>A first thought would =
be to wonder how all three jets would have gotten out of alignment? I =
would check the needles for alignment and wear first, before digging =
into the jets.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>-------------=
----------------------<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>All the =
best,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Al =
Fuller<o:p></o:p></span></p></div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Healeys &lt;[email-masked]&gt; <b>On Behalf Of </b>Simon =
Lachlan via Healeys<br><b>Sent:</b> Monday, August 5, 2024 7:09 =
AM<br><b>To:</b> Healeys =
&lt;[email-masked]&gt;<br><b>Subject:</b> [Healeys] HD6 jet =
adjustment<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p><span lang=3DEN-GB =
style=3D'font-family:"Times New Roman",serif'>I&#8217;m told that the =
jets on my HD6s are not quite correctly centred. The pistons do not fall =
fast enough nor with a satisfactory</span><span lang=3DEN-GB> =
</span><span lang=3DEN-GB style=3D'font-family:"Times New =
Roman",serif'>&#8220;click&#8221;. I have three of them in my MkII BT7. =
Do I have to</span><span lang=3DEN-GB> </span><span lang=3DEN-GB =
style=3D'font-family:"Times New Roman",serif'>take the carbs out or can =
it be done in situ? Not a lot of =
room&#8230;&#8230;..</span><o:p></o:p></p><p><span lang=3DEN-GB =
style=3D'font-family:"Times New =
Roman",serif'>Simon</span><o:p></o:p></p></div></body></html>
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_______________________________________________

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive/healeys

[email-masked]
http://autox.team.net/mailman/listinfo/healeys

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From: JSARCH via Healeys <[email-masked]>
Date: Tue, 6 Aug 2024 12:13:10 -0700 boundary="----=_NextPart_000_075E_01DAE7FA.02656290"

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I would say most likely based on the attached instructions the SU Service
Manual. There is a specification for the fall rate of the piston, at least
for the HS4 carbs. You might find it on the SU Berlin website.
https://sucarb.co.uk/technical/category/hd-type-carburetters

John

Simon

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link=3D"#0563C1" vlink=3D"#954F72" style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>I would say most likely based =
on the attached instructions the SU Service Manual. There is a =
specification for the fall rate of the piston, at least for the HS4 =
carbs. You might find it on the SU Berlin website. <a =
href=3D"https://sucarb.co.uk/technical/category/hd-type-carburetters">htt=
ps://sucarb.co.uk/technical/category/hd-type-carburetters</a><o:p></o:p><=
/p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>John<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Healeys =
&lt;[email-masked]&gt; <b>On Behalf Of </b>Simon Lachlan =
via Healeys<br><b>Sent:</b> Monday, August 5, 2024 7:09 AM<br><b>To:</b> =
Healeys &lt;[email-masked]&gt;<br><b>Subject:</b> [Healeys] HD6 =
jet adjustment<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p><span lang=3DEN-GB =
style=3D'font-family:"Times New Roman",serif'>I&#8217;m told that the =
jets on my HD6s are not quite correctly centred. The pistons do not fall =
fast enough nor with a satisfactory</span><span lang=3DEN-GB> =
</span><span lang=3DEN-GB style=3D'font-family:"Times New =
Roman",serif'>&#8220;click&#8221;. I have three of them in my MkII BT7. =
Do I have to</span><span lang=3DEN-GB> </span><span lang=3DEN-GB =
style=3D'font-family:"Times New Roman",serif'>take the carbs out or can =
it be done in situ? Not a lot of =
room&#8230;&#8230;..</span><o:p></o:p></p><p><span lang=3DEN-GB =
style=3D'font-family:"Times New =
Roman",serif'>Simon</span><o:p></o:p></p></div></body></html>
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[email-masked]

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From: warthodson--- via Healeys <[email-masked]>
Date: Wed, 7 Aug 2024 14:39:11 +0000 (UTC)

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 The fall rate test is for the piston fit in the chamber not the centering =
of the jet(s) on HD6's.The air cleaners need to be removed, not easy on a t=
ri-carb setup, to gain access to the jet centering fittings. It is difficul=
t for me to think all 3 needles are not centered.If all three carbs have fa=
iled the piston fall rate test, my first thought is that the pistons have b=
ecome mis-matched with their mating bell housings.=C2=A0=C2=A0Gary Hodson
    On Tuesday, August 6, 2024 at 02:51:47 PM CDT, JSARCH via Healeys <heal=
[email-masked]> wrote:  =20

=20
I would say most likely based on the attached instructions the SU Service M=
anual. There is a specification for the fall rate of the piston, at least f=
or the HS4 carbs. You might find it on the SU Berlin website. https://sucar=
b.co.uk/technical/category/hd-type-carburetters

 =C2=A0

John

 =C2=A0

From: Healeys <[email-masked]> On Behalf Of Simon Lachlan v=
ia Healeys
Sent: Monday, August 5, 2024 7:09 AM
To: Healeys <[email-masked]>
Subject: [Healeys] HD6 jet adjustment

 =C2=A0

I=E2=80=99m told that the jets on my HD6s are not quite correctly centred. =
The pistons do not fall fast enough nor with a satisfactory =E2=80=9Cclick=
=E2=80=9D. I have three of them in my MkII BT7. Do I have to take the carbs=
 out or can it be done in situ? Not a lot of room=E2=80=A6=E2=80=A6..

Simon

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e/healeys

[email-masked]

[email-masked]

 =20
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<html><head></head><body><div class=3D"ydp70e55f7fyahoo-style-wrap" style=
=3D"font-family:Comic Sans MS, sans-serif;font-size:16px;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">The fall rate test is for th=
e piston fit in the chamber not the centering of the jet(s) on HD6's.</div>=
<div dir=3D"ltr" data-setdir=3D"false">The air cleaners need to be removed,=
 not easy on a tri-carb setup, to gain access to the jet centering fittings=
. It is difficult for me to think all 3 needles are not centered.</div><div=
 dir=3D"ltr" data-setdir=3D"false">If all three carbs have failed the pisto=
n fall rate test, my first thought is that the pistons have become mis-matc=
hed with their mating bell housings.&nbsp;&nbsp;</div><div dir=3D"ltr" data=
-setdir=3D"false">Gary Hodson</div><div><br></div>
       =20
        </div><div id=3D"ydp3c5aada5yahoo_quoted_3722322748" class=3D"ydp3c=
5aada5yahoo_quoted"><div class=3D"ydp3c5aada5yahoo-style-wrap" style=3D"fon=
t-family:Comic Sans MS, sans-serif;font-size:16px;">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div class=3D"ydp3c5aada5quoted-text-header">
                        On Tuesday, August 6, 2024 at 02:51:47 PM CDT, JSAR=
CH via Healeys &lt;[email-masked]&gt; wrote:
                    </div>
                </div><div style=3D"font-family:'Helvetica Neue', Helvetica=
, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #cc=
c;padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"ydp3c5aada5inline_rep=
ly_quote_container" data-split-quote-node=3D"true">
                <div><br></div><div><br></div>
                <div><div id=3D"ydp3c5aada5yiv7087891246"><div><div class=
=3D"ydp3c5aada5yiv7087891246WordSection1"><p class=3D"ydp3c5aada5yiv7087891=
246MsoNormal">I would say most likely based on the attached instructions th=
e SU Service Manual. There is a specification for the fall rate of the pist=
on, at least for the HS4 carbs. You might find it on the SU Berlin website.=
 <a shape=3D"rect" href=3D"https://sucarb.co.uk/technical/category/hd-type-=
carburetters" rel=3D"nofollow" target=3D"_blank">https://sucarb.co.uk/techn=
ical/category/hd-type-carburetters</a></p><p class=3D"ydp3c5aada5yiv7087891=
246MsoNormal"> &nbsp;</p><p class=3D"ydp3c5aada5yiv7087891246MsoNormal">Joh=
n</p><p class=3D"ydp3c5aada5yiv7087891246MsoNormal"> &nbsp;</p><div id=3D"y=
dp3c5aada5yiv7087891246yqt29257" class=3D"ydp3c5aada5yiv7087891246yqt374741=
6230"><div><div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding=
:3.0pt 0in 0in 0in;"><p class=3D"ydp3c5aada5yiv7087891246MsoNormal"><b>From=
:</b> Healeys &lt;[email-masked]&gt; <b>On Behalf Of </b>Si=
mon Lachlan via Healeys<br clear=3D"none"><b>Sent:</b> Monday, August 5, 20=
24 7:09 AM<br clear=3D"none"><b>To:</b> Healeys &lt;[email-masked]&=
gt;<br clear=3D"none"><b>Subject:</b> [Healeys] HD6 jet adjustment</p></div=
></div><p class=3D"ydp3c5aada5yiv7087891246MsoNormal"> &nbsp;</p><p><span l=
ang=3D"EN-GB" style=3D"font-family:New serif;">I=E2=80=99m told that the je=
ts on my HD6s are not quite correctly centred. The pistons do not fall fast=
 enough nor with a satisfactory</span><span lang=3D"EN-GB"> </span><span la=
ng=3D"EN-GB" style=3D"font-family:New serif;">=E2=80=9Cclick=E2=80=9D. I ha=
ve three of them in my MkII BT7. Do I have to</span><span lang=3D"EN-GB"> <=
/span><span lang=3D"EN-GB" style=3D"font-family:New serif;">take the carbs =
out or can it be done in situ? Not a lot of room=E2=80=A6=E2=80=A6..</span>=
</p><p><span lang=3D"EN-GB" style=3D"font-family:New serif;">Simon</span></=
p></div></div></div></div><div class=3D"ydp3c5aada5yqt3747416230" id=3D"ydp=
3c5aada5yqt51411">_______________________________________________<br clear=
=3D"none">Support Team.Net <a shape=3D"rect" href=3D"http://www.team.net/do=
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[email-masked]

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From: Bob Spidell via Healeys <[email-masked]>
Date: Wed, 7 Aug 2024 08:08:05 -0700

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Good point, Gary.

Also, a good first step would be to remove the vacuum 'dashpots' and 
inspect the jets for out-of-round; if the jets are off-centered for long 
they will get oblonged and the needles might have a flat spot, making 
fine-tuning difficult. I only have HD8s but, IIRC, the jet-centering 
collars can only be reached, for all practical purposes, from underneath 
(not an easy task). Not as cheap as they used to be, but this little kit 
has come in handy, and it has a plug used for centering the jet collar 
that works well and they can get 2-3 carbs reasonably well-synchronized.

https://mossmotors.com/386-300-carburetor-tool-kit-su?gad_source=1&gclid=Cj0KCQjwtsy1BhD7ARIsAHOi4xYxV1_gx0C6U51f4fS5rS9FuYhAwbsD9dnKWxoYGi_BtM3jJp2oQ3IaArpvEALw_wcB

bs

On 8/7/2024 7:39 AM, warthodson--- via Healeys wrote:
> The fall rate test is for the piston fit in the chamber not the 
> centering of the jet(s) on HD6's.
> The air cleaners need to be removed, not easy on a tri-carb setup, to 
> gain access to the jet centering fittings. It is difficult for me to 
> think all 3 needles are not centered.
> If all three carbs have failed the piston fall rate test, my first 
> thought is that the pistons have become mis-matched with their mating 
> bell housings.
> Gary Hodson
>
> On Tuesday, August 6, 2024 at 02:51:47 PM CDT, JSARCH via Healeys 
> <[email-masked]> wrote:
>
>
> I would say most likely based on the attached instructions the SU 
> Service Manual. There is a specification for the fall rate of the 
> piston, at least for the HS4 carbs. You might find it on the SU Berlin 
> website. https://sucarb.co.uk/technical/category/hd-type-carburetters
>
> John
>
> *From:* Healeys <[email-masked]> *On Behalf Of *Simon 
> Lachlan via Healeys
> *Sent:* Monday, August 5, 2024 7:09 AM
> *To:* Healeys <[email-masked]>
> *Subject:* [Healeys] HD6 jet adjustment
>
> I’m told that the jets on my HD6s are not quite correctly centred. The 
> pistons do not fall fast enough nor with a satisfactory“click”. I have 
> three of them in my MkII BT7. Do I have totake the carbs out or can it 
> be done in situ? Not a lot of room……..
>
> Simon
>
>
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    Good point, Gary. <br>
    <br>
    Also, a good first step would be to remove the vacuum 'dashpots' and
    inspect the jets for out-of-round; if the jets are off-centered for
    long they will get oblonged and the needles might have a flat spot,
    making fine-tuning difficult. I only have HD8s but, IIRC, the
    jet-centering collars can only be reached, for all practical
    purposes, from underneath (not an easy task). Not as cheap as they
    used to be, but this little kit has come in handy, and it has a plug
    used for centering the jet collar that works well and they can get
    2-3 carbs reasonably well-synchronized. <br>
    <br>
<a class="moz-txt-link-freetext" href="https://mossmotors.com/386-300-carburetor-tool-kit-su?gad_source=1&amp;gclid=Cj0KCQjwtsy1BhD7ARIsAHOi4xYxV1_gx0C6U51f4fS5rS9FuYhAwbsD9dnKWxoYGi_BtM3jJp2oQ3IaArpvEALw_wcB">https://mossmotors.com/386-300-carburetor-tool-kit-su?gad_source=1&amp;gclid=Cj0KCQjwtsy1BhD7ARIsAHOi4xYxV1_gx0C6U51f4fS5rS9FuYhAwbsD9dnKWxoYGi_BtM3jJp2oQ3IaArpvEALw_wcB</a><br>
    <br>
    bs<br>
    <br>
    <div class="moz-cite-prefix">On 8/7/2024 7:39 AM, warthodson--- via
      Healeys wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email-masked]">
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      <div class="ydp70e55f7fyahoo-style-wrap"
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        <div dir="ltr" data-setdir="false">The fall rate test is for the
          piston fit in the chamber not the centering of the jet(s) on
          HD6's.</div>
        <div dir="ltr" data-setdir="false">The air cleaners need to be
          removed, not easy on a tri-carb setup, to gain access to the
          jet centering fittings. It is difficult for me to think all 3
          needles are not centered.</div>
        <div dir="ltr" data-setdir="false">If all three carbs have
          failed the piston fall rate test, my first thought is that the
          pistons have become mis-matched with their mating bell
          housings.  </div>
        <div dir="ltr" data-setdir="false">Gary Hodson</div>
        <div><br>
        </div>
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      <div id="ydp3c5aada5yahoo_quoted_3722322748"
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            <div class="ydp3c5aada5quoted-text-header"> On Tuesday,
              August 6, 2024 at 02:51:47 PM CDT, JSARCH via Healeys
              <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a> wrote: </div>
          </div>
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style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #ccc;padding-left: 8px;margin: 0px 0px 0px 8px"
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                  <div class="ydp3c5aada5yiv7087891246WordSection1">
                    <p class="ydp3c5aada5yiv7087891246MsoNormal">I would
                      say most likely based on the attached instructions
                      the SU Service Manual. There is a specification
                      for the fall rate of the piston, at least for the
                      HS4 carbs. You might find it on the SU Berlin
                      website. <a shape="rect"
href="https://sucarb.co.uk/technical/category/hd-type-carburetters"
                        rel="nofollow" target="_blank"
                        moz-do-not-send="true"
                        class="moz-txt-link-freetext">https://sucarb.co.uk/technical/category/hd-type-carburetters</a></p>
                    <p class="ydp3c5aada5yiv7087891246MsoNormal">  </p>
                    <p class="ydp3c5aada5yiv7087891246MsoNormal">John</p>
                    <p class="ydp3c5aada5yiv7087891246MsoNormal">  </p>
                    <div id="ydp3c5aada5yiv7087891246yqt29257"
                      class="ydp3c5aada5yiv7087891246yqt3747416230">
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style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in;">
                          <p class="ydp3c5aada5yiv7087891246MsoNormal"><b>From:</b>
                            Healeys
                            <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a> <b>On
                              Behalf Of </b>Simon Lachlan via Healeys<br
                              clear="none">
                            <b>Sent:</b> Monday, August 5, 2024 7:09 AM<br
                              clear="none">
                            <b>To:</b> Healeys
                            <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a><br
                              clear="none">
                            <b>Subject:</b> [Healeys] HD6 jet adjustment</p>
                        </div>
                      </div>
                      <p class="ydp3c5aada5yiv7087891246MsoNormal">  </p>
                      <p><span style="font-family:New serif;"
                          lang="EN-GB">I’m told that the jets on my HD6s
                          are not quite correctly centred. The pistons
                          do not fall fast enough nor with a
                          satisfactory</span><span lang="EN-GB"> </span><span
                          style="font-family:New serif;" lang="EN-GB">“click”.
                          I have three of them in my MkII BT7. Do I have
                          to</span><span lang="EN-GB"> </span><span
                          style="font-family:New serif;" lang="EN-GB">take
                          the carbs out or can it be done in situ? Not a
                          lot of room……..</span></p>
                      <p><span style="font-family:New serif;"
                          lang="EN-GB">Simon</span></p>
                    </div>
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[email-masked]

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