[Healeys] Carb queries on a Tricarb with 3 HD6s

[Alan Seigrist]

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 PM Bob Spidell via Healeys <
healeys at 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 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* 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 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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