This is a multi-part message in MIME format.
--===============0697337095328765858==
boundary="------------YFBGYAzEsn1Lqd8AxTYCLd93"
Content-Language: en-US
This is a multi-part message in MIME format.
--------------YFBGYAzEsn1Lqd8AxTYCLd93
Content-Transfer-Encoding: 8bit
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
> <healeys@autox.team.net> 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 <healeys-bounces@autox.team.net> *On Behalf Of *Simon
> Lachlan via Healeys
> *Sent:* Monday, August 5, 2024 7:09 AM
> *To:* Healeys <healeys@autox.team.net>
> *Subject:* [Healeys] HD6 jet adjustment
>
> Iâ??m told that the jets on my HD6s are not quite correctly centred. The
> pistons do not fall fast enough nor with a satisfactoryâ??clickâ??. 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
>
>
--------------YFBGYAzEsn1Lqd8AxTYCLd93
Content-Transfer-Encoding: 8bit
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
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&gclid=Cj0KCQjwtsy1BhD7ARIsAHOi4xYxV1_gx0C6U51f4fS5rS9FuYhAwbsD9dnKWxoYGi_BtM3jJp2oQ3IaArpvEALw_wcB";>https://mossmotors.com/386-300-carburetor-tool-kit-su?gad_source=1&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:972230340.3989478.1723041551949@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="ydp70e55f7fyahoo-style-wrap"
style="font-family:Comic Sans MS, sans-serif;font-size:16px;">
<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>
</div>
<div id="ydp3c5aada5yahoo_quoted_3722322748"
class="ydp3c5aada5yahoo_quoted">
<div class="ydp3c5aada5yahoo-style-wrap"
style="font-family:Comic Sans MS, sans-serif;font-size:16px;">
<div
style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<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:healeys@autox.team.net";><healeys@autox.team.net></a> wrote:
</div>
</div>
<div
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"
class="ydp3c5aada5inline_reply_quote_container"
data-split-quote-node="true">
<div><br>
</div>
<div><br>
</div>
<div>
<div id="ydp3c5aada5yiv7087891246">
<div>
<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"> Â </p>
<p class="ydp3c5aada5yiv7087891246MsoNormal">John</p>
<p class="ydp3c5aada5yiv7087891246MsoNormal"> Â </p>
<div id="ydp3c5aada5yiv7087891246yqt29257"
class="ydp3c5aada5yiv7087891246yqt3747416230">
<div>
<div
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:healeys-bounces@autox.team.net";><healeys-bounces@autox.team.net></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:healeys@autox.team.net";><healeys@autox.team.net></a><br
clear="none">
<b>Subject:</b> [Healeys] HD6 jet adjustment</p>
</div>
</div>
<p class="ydp3c5aada5yiv7087891246MsoNormal"> Â </p>
<p><span style="font-family:New serif;"
lang="EN-GB">Iâ??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">â??clickâ??.
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>
</div>
</div>
</div>
<br>
</div>
</div>
</div>
</div>
</blockquote>
</body>
</html>
--------------YFBGYAzEsn1Lqd8AxTYCLd93--
--===============0697337095328765858==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Archive: http://www.team.net/pipermail/healeys
http://autox.team.net/archive/healeys
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============0697337095328765858==--
|