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[TR] fast idle problem

Subject: [TR] fast idle problem
From: Bob Leaver <>
Date: Tue, 12 May 2020 15:58:26 -0600
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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