The Moss reamer cuts a hole that is 10 thousands (nominal) 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 piloted
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 throttle bushing holes perfectly vertical.
The body would have to be clamped to an angle plate in some manner. Such a
reamer, of the right size, can be found here...
https://www.panamericantool.com/high-speed-steel-reamers/high-speed-steel-piloted-chucking-reamers.html
Part number 99-703 is what you would want. But, unless you've done this kind
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 gaskets and
nothing. The only possibility I can come up with is air getting around 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 reamer 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
cheaper reamer to use? Thanks, Bob
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