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Bob,
Are you sure the linkage is allowing the butterflies to close completely? =
That was the problem I had when I first put the rebuilt carbs back on my ca=
r.
Cliff
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=3D550986> for Window=
s 10
Sent: Tuesday, May 12, 2020 9:03 PM
riumphs@autox.team.net>
Subject: Re: [TR] fast idle problem
The Moss reamer cuts a hole that is 10 thousands (nominal) oversize, and re=
quires you to use ten thousandths oversize throttle shafts. The reamer has=
an extended pilot, so that, even when reaming by hand, the alignment betwe=
en the holes on each side of the throttle body is maintained. To that exte=
nt, it is a special reamer, which accounts for its price. I found other pi=
loted reamers, but they are chucking reamers and the pilot is quite short, =
so you would have to set the carb body up on a good drill press (or vertica=
l mill, preferably) with the axis of the throttle bushing holes perfectly v=
ertical. The body would have to be clamped to an angle plate in some manne=
r. Such a reamer, of the right size, can be found here...
https://www.panamericantool.com/high-speed-steel-reamers/high-speed-steel-p=
iloted-chucking-reamers.html
Part number 99-703 is what you would want. But, unless you've done this ki=
nd of set-up before, I wouldn't recommend doing this. I think sending the =
bodies out to have new oversized shafts fitted might be the most expedient =
thing.
Mike
Michael J Marr, P.E., CEng.
Albion Technical Services
W5918 Hackbarth Rd
Fort Atkinson, WI 53538
Cell: 630-202-0065
Email: mmarr@albiontechnical.com
-----Original Message-----
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Bob Leaver
Sent: Tuesday, May 12, 2020 4:58 PM
To: Triumphs@autox.team.net
Subject: [TR] fast idle problem
I have a 1965 Triumph TR4a that I rebuilt the SU carbs and now I can't get =
the idle below about 1500. I've tried all the screws and checked all gasket=
s and nothing. The only possibility I can come up with is air getting aroun=
d the shafts. When rebuilding the cars I didn't replace the shafts because =
I didn't have a reamer. Moss has a reamer for $290.00. I looked on line and=
can't find a less expensive replacement. The book states the size of the r=
eamer is 5/16" + 0.0105". What kind of measurement is this? Can you use a 5=
/16" reamer?
Does anyone have ideas how I can get the idle down? Does anyone know of a c=
heaper reamer to use? Thanks, Bob
** triumphs@autox.team.net **
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<p class=3D"MsoNormal">Bob,</p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Are you sure the linkage is allowing the butterflies=
to close completely? That was the problem I had when I first put the=
rebuilt carbs back on my car.</p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Cliff</p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Sent from <a href=3D"https://go.microsoft.com/fwlink=
/?LinkId=3D550986">
Mail</a> for Windows 10</p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<div style=3D"mso-element:para-border-div;border:none;border-top:solid #E1E=
1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class=3D"MsoNormal" style=3D"border:none;padding:0in"><b>From: </b><a hr=
ef=3D"mailto:mmarr@albiontechnical.com";>Michael Marr</a><br>
<b>Sent: </b>Tuesday, May 12, 2020 9:03 PM<br>
<b>To: </b><a href=3D"mailto:boleaver@gmail.com";>Bob Leaver</a>; <a href=3D=
"mailto:Triumphs@autox.team.net";>
Triumphs@autox.team.net</a><br>
<b>Subject: </b>Re: [TR] fast idle problem</p>
</div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">The Moss reamer cuts a hole that is 10 thousands (no=
minal) oversize, and requires you to use ten thousandths oversize throttle =
shafts. The reamer has an extended pilot, so that, even when reaming =
by hand, the alignment between the holes
on each side of the throttle body is maintained. To that extent, it =
is a special reamer, which accounts for its price. I found other pilo=
ted reamers, but they are chucking reamers and the pilot is quite short, so=
you would have to set the carb body up on
a good drill press (or vertical mill, preferably) with the axis of the thr=
ottle bushing holes perfectly vertical. The body would have to be cla=
mped to an angle plate in some manner. Such a reamer, of the right si=
ze, can be found here...<br>
<br>
<a href=3D"https://www.panamericantool.com/high-speed-steel-reamers/high-sp=
eed-steel-piloted-chucking-reamers.html">https://www.panamericantool.com/hi=
gh-speed-steel-reamers/high-speed-steel-piloted-chucking-reamers.html</a><b=
r>
<br>
Part number 99-703 is what you would want. But, unless you've done th=
is kind of set-up before, I wouldn't recommend doing this. I think se=
nding the bodies out to have new oversized shafts fitted might be the most =
expedient thing.<br>
<br>
Mike<br>
<br>
<br>
Michael J Marr, P.E., CEng.<br>
Albion Technical Services<br>
W5918 Hackbarth Rd<br>
Fort Atkinson, WI 53538<br>
<br>
Cell: 630-202-0065<br>
Email: mmarr@albiontechnical.com<br>
<br>
-----Original Message-----<br>
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Bob Lea=
ver<br>
Sent: Tuesday, May 12, 2020 4:58 PM<br>
To: Triumphs@autox.team.net<br>
Subject: [TR] fast idle problem<br>
<br>
I have a 1965 Triumph TR4a that I rebuilt the SU carbs and now I can't get =
the idle below about 1500. I've tried all the screws and checked all gasket=
s and nothing. The only possibility I can come up with is air getting aroun=
d the shafts. When rebuilding the
cars I didn't replace the shafts because I didn't have a reamer. Moss has =
a reamer for $290.00. I looked on line and can't find a less expensive repl=
acement. The book states the size of the reamer is 5/16" + 0.0105&=
quot;. What kind of measurement is this? Can you
use a 5/16" reamer?<br>
Does anyone have ideas how I can get the idle down? Does anyone know of a c=
heaper reamer to use? Thanks, Bob<br>
** triumphs@autox.team.net **<br>
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