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The issue with jets not being centered--besides the 'drop test'--is that
the needles will rub against the jets and eventually cause the orifice
them to become oblonged. This makes the already somewhat crude metering
of fuel into the carb throats even less precise. The jet is held in
place by a 'bearing'--really more of a sleeve--which is loosened to
allow the jet to be positioned. I don't think the diaphragm is an
issue--it can only be assembled one way--unless it was really bodged. I
/think /it might be possible to do in situ, but on the bench would be
easiest. If you haven't replaced the jets in over 20 years or so it
would be a good idea to replace with ethanol-resistant ones.
I'm a fan of this little kit (it was probably half this price when I
bought it years ago). The little knob thing is a jet centering tool; it
replaces a needle in the piston and centers the jet properly. I used it
to center the jets on my HD8s over 20 years ago and haven't had to touch
them. The little end wrench is useful for setting jet height on non-HD
carbs and, if you want to try the 'lift piston 1/32" test' the wire
points are the best way to do it.
https://mossmotors.com/386-300-carburetor-tool-kit-su
On 5/8/2025 3:26 PM, simon.lachlan--- via Healeys wrote:
> They_Â are_Â HD6s, not HS4s.
> A good local mechanic pointed out that my three "piston lifting pins"
> don't drop with a satisfactory click or whatever. He suggested that
> this indicates that the jets are not correctly centred. He proposes
> taking the carbs off the car and centring them appropriately.
>
> 1.
> How important is this "click"? Not centred correctly....does this
> effect performance? Presumably their falling at different speeds
> indicates a certain lack of synchronicity between the carbs??
> 2.
> Am I going to need new jets? Approx £43:00 each. Seems to me that
> being screwed down into wrong position may have distorted the
> rubber.....
>
> I could do the work myself but fear that other things are getting in
> the way right now.
> Simon
>
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The issue with jets not being centered--besides the 'drop test'--is
that the needles will rub against the jets and eventually cause the
orifice them to become oblonged. This makes the already somewhat
crude metering of fuel into the carb throats even less precise. The
jet is held in place by a 'bearing'--really more of a sleeve--which
is loosened to allow the jet to be positioned. I don't think the
diaphragm is an issue--it can only be assembled one way--unless it
was really bodged. I <i>think </i>it might be possible to do in
situ, but on the bench would be easiest. If you haven't replaced the
jets in over 20 years or so it would be a good idea to replace with
ethanol-resistant ones.<br>
<br>
I'm a fan of this little kit (it was probably half this price when I
bought it years ago). The little knob thing is a jet centering tool;
it replaces a needle in the piston and centers the jet properly. I
used it to center the jets on my HD8s over 20 years ago and haven't
had to touch them. The little end wrench is useful for setting jet
height on non-HD carbs and, if you want to try the 'lift piston
1/32" test' the wire points are the best way to do it.<br>
<br>
<a class="moz-txt-link-freetext"
href="https://mossmotors.com/386-300-carburetor-tool-kit-su";>https://mossmotors.com/386-300-carburetor-tool-kit-su</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 5/8/2025 3:26 PM, simon.lachlan---
via Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CWLP265MB1492ADC08666D015540DE2BDF38BA@CWLP265MB1492.GBRP265.PROD.OUTLOOK.COM">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style type="text/css" style="display:none;">P
{margin-top:0;margin-bottom:0;}</style>
<div class="elementToProof"
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri,
Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
They<u>Â are</u>Â HD6s, not HS4s.</div>
<div class="elementToProof"
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri,
Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
A good local mechanic pointed out that my three "piston lifting
pins" don't drop with a satisfactory click or whatever. He
suggested that this indicates that the jets are not correctly
centred. He proposes taking the carbs off the car and centring
them appropriately.</div>
<ol start="1"
data-editing-info="{"applyListStyleFromLevel":false,"orderedStyleType":10}"
style="margin-top: 0px; margin-bottom: 0px;">
<li
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri,
Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); list-style-type:
"A) ";">
<div class="elementToProof">How important is this "click"? Not
centred correctly....does this effect performance?
Presumably their falling at different speeds indicates a
certain lack of synchronicity between the carbs??</div>
</li>
<li
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri,
Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); list-style-type:
"B) ";">
<div class="elementToProof">Am I going to need new jets?
Approx £43:00 each. Seems to me that being screwed down into
wrong position may have distorted the rubber.....</div>
</li>
</ol>
<div class="elementToProof"
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri,
Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
I could do the work myself but fear that other things are
getting in the way right now.</div>
<div class="elementToProof"
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri,
Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Simon</div>
<div class="elementToProof"
style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri,
Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<pre wrap="" class="moz-quote-pre">
</pre>
</blockquote>
<br>
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