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Hi Simon -
The click is very important because without it, no click will lead to
needle wear and your car will never idle properly. eventually the car will
run rich and waste fuel.
On HDs it is not possible to center the jet without removing the carbs.
It's actually a fairly quick procedure and can be done in the course of a
morning if you are motivated.
Best,
Alan
On Thu, May 8, 2025 at 11:48=E2=80=AFPM Bob Spidell via Healeys <
healeys@autox.team.net> wrote:
> 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 th=
em
> to become oblonged. This makes the already somewhat crude metering of fue=
l
> 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 repla=
ce
> 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 t=
o
> center the jets on my HD8s over 20 years ago and haven't had to touch the=
m.
> The little end wrench is useful for setting jet height on non-HD carbs an=
d,
> 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* are* 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 indic=
ates
> a certain lack of synchronicity between the carbs??
> 2. Am I going to need new jets? Approx =C2=A343:00 each. Seems to me t=
hat
> 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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<div dir=3D"ltr">Hi Simon -<div><br></div><div>The click is very important =
because without it, no click will lead to needle wear and your car will nev=
er idle properly.=C2=A0 eventually the car will run rich and waste fuel.<br=
><br>On HDs it is not possible to center the jet without removing the carbs=
.=C2=A0 It's actually a fairly quick procedure and can be done in the c=
ourse of a morning if you are motivated.</div><div><br></div><div>Best,<br>=
<br>Alan</div></div><br><div class=3D"gmail_quote gmail_quote_container"><d=
iv dir=3D"ltr" class=3D"gmail_attr">On Thu, May 8, 2025 at 11:48=E2=80=AFPM=
Bob Spidell via Healeys <<a href=3D"mailto:healeys@autox.team.net";>heal=
eys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex"><u></u>
=20
=20
=20
<div>
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--w=
hich
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 th=
e
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 href=3D"https://mossmotors.com/386-300-carburetor-tool-kit-su"; targe=
t=3D"_blank">https://mossmotors.com/386-300-carburetor-tool-kit-su</a><br>
<br>
<br>
<div>On 5/8/2025 3:26 PM, simon.lachlan---
via Healeys wrote:<br>
</div>
<blockquote type=3D"cite">
=20
=20
<div style=3D"font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontServic=
e,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
They<u>=C2=A0are</u>=C2=A0HD6s, not HS4s.</div>
<div style=3D"font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontServic=
e,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
A good local mechanic pointed out that my three "piston liftin=
g
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=3D"1" style=3D"margin-top:0px;margin-bottom:0px">
<li style=3D"font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontServi=
ce,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);list-style-=
type:"A) "">
<div>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=3D"font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontServi=
ce,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0);list-style-=
type:"B) "">
<div>Am I going to need new jets?
Approx =C2=A343:00 each. Seems to me that being screwed down in=
to
wrong position may have distorted the rubber.....</div>
</li>
</ol>
<div style=3D"font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontServic=
e,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 style=3D"font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontServic=
e,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Simon</div>
<div style=3D"font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontServic=
e,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<br>
</div>
<pre></pre>
</blockquote>
<br>
</div>
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</blockquote></div>
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