[Healeys] Carb tuning kit WAS: HS4 Tri-carb tuning

Mark Donaldson ardmorebusiness at xtra.co.nz
Tue Jul 7 16:49:46 MDT 2020

My jet adjustment spanner (wrench) has a hole in the end.  I learned many years ago that threading a piece of string through it is wonderful insurance.

Mine is also steel, and stamped SPEEDWELL.  I’ve had it for about 40 years.  I bought it when my wife had a 1961 997 Austin-Cooper.

I also have an original jet-centring tool.  It has proved invaluable on occasion, and so simple to use.







From: Michael Salter <michaelsalter at gmail.com> 
Sent: Wednesday, 8 July 2020 3:53 a.m.
To: Bob Spidell <bspidell at comcast.net>
Cc: healeys at autox.team.net
Subject: Re: [Healeys] Carb tuning kit WAS: HS4 Tri-carb tuning


And be very careful not to drop the little wrench down inside the front suspension strut like I did yesterday 😠


On Tue., Jul. 7, 2020, 11:24 a.m. Bob Spidell, <bspidell at comcast.net <mailto:bspidell at comcast.net> > wrote:


I don't have mine handy, but from memory:

The two black plastic rod-looking things go into the center of the vacuum pistons. In those go the 90-deg bent wires. With these you can see the pistons rise and fall, so as to even airflow. They also allow ballpark 1/32 piston lifts to check mixture.

The small brass plug-looking thing is a jet-centering tool that goes in place of a jet; very handy if you're doing a complete overhaul and replacing the jets.

By far the most useful tool is the small wrench that looks like the tool some people use to floss; it's the only way I can get to the jet adjusting nuts on my BN2. Any other tool--wrench, pliers, etc.--would be almost impossible to use with the carbs on the car.

All in all, a simple but useful collection of tools. Did I miss any?


On 7/7/2020 4:41 AM, Tom via Healeys wrote:


I've always wondered:   what do each of those little tools in the tuning kit do?


- Tom


On Mon, Jul 6, 2020 at 10:08 PM John Spaur via Healeys <healeys at autox.team.net <mailto:healeys at autox.team.net> > wrote:

Bob, raising the piston 1/32” is not my issue. I am wondering why the engine stalls when the center carb piston is lifted all the way up and the others don’t stall the engine when lifted all the way up. I sent another post with a link for that. The carbs are well synced, I used the S.U tuning kit to check the piston lift and they are spot on.


From: Healeys [mailto:healeys-bounces at autox.team.net <mailto:healeys-bounces at autox.team.net> ] On Behalf Of Bob Spidell
Sent: Monday, July 6, 2020 6:32 PM
To: healeys at autox.team.net <mailto:healeys at autox.team.net> 
Subject: Re: [Healeys] HS4 Tri-carb tuning


After much effort and consideration, I decided there must be some Brits who wrote that 'procedure' laughing their asses off knowing there is no practical* way to lift the pistons exactly 1/32"

* But you can, if you have the little wire thingies in the poor man's tuning kit--actually quite useful--stick the wire thingies in the piston and gauge the piston rise; the wires themselves are pretty close to 1/32" thick



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