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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&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>
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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>
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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:healeys@autox.team.net"><healeys@autox.team.net></a> wrote: </div>
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<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>
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<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>
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<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>
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