Hi Andy,
The fast idle problem could also be caused by other things -- such as a
vacuum leak. It could be located at your very worn shaft bushings, assuming
they are worn. You might try the old trick of squirting some starting fluid
onto the shafts at those points, and see if the idle speed changes. If it
does, you need new bushings and shafts.
Unfortunately, the only way I know of to determine if the butterflies are
really not closing all the way is to take the carbs off the manifold.
Sumner
----- Original Message -----
From: Andy <amdixon@erols.com>
To: Sumner Weisman <sweisman@gis.net>
Cc: Triumphs <triumphs@autox.team.net>
Sent: Wednesday, May 05, 1999 7:24 PM
Subject: Re: TR3 Carbs -- Poor machining?
> Sumner,
> I also have a similar problem on my '59 - the one where the mixture won't
> lean out properly.
> The PO, or his mechanic, even took out the fast idle screw. With the idle
> screws all the way down I'm at about 2000 rpm.
> Well,,, the car is, not me really.
> Andy D.
>
> On 05/05/99 06:58 PM Sumner Weisman said...
> >
> >My newly rebuilt SU carbs were installed a couple of months ago and are
> >working nicely. I used the TRF rebuild kits, which were fine. Prior to
> >rebuilding, I sent the bodies out to a very popular company for rebushing
> >and new shafts. That's where the problem came in, and I'm just passing
it
> >along for information for others contemplating the same thing.
> >
> >When I got them back, they looked great and I started reassembling them.
> >When I mounted the throttle stops to the shafts with new tapered pins, I
> >noticed that, even with no adjustment screws installed in the throttle
> >stops, the butterflies didn't quite close and the stops were bottomed
out.
> >They were nearly closed, but I could see daylight and I sure didn't want
> >them partly open when I was trying to adjust the slow idle speed. My
> >conclusion was that the holes in the shafts were drilled slightly at the
> >wrong angles.
> >
> >I had two choices. I could have sent them back, but of course I was in a
> >hurry. So, I ended up drilling new holes through the shafts and the
collars
> >of the throttle stops, about 90 degrees from the original holes. The
holes
> >were drilled at the proper angle so that the butterflies not only closed
> >completely, but there was now plenty of adjustment range for the screws
> as
> >well. That completely solved the problem, and everything works fine.
> >
> >The reason for this note is that I've been wondering if anyone else has
had
> >this experience. Is there any possibility that there was a variation in
the
> >angle of the original holes drilled at the factory in the throttle stops?
I
> >suspect not, and that there was a just slight screw-up at the company
that
> >installed the shafts. What do you think?
> >
> >Sumner Weisman
> >62 TR3B
>
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