[Top] [All Lists]

Re: [TR] fast idle problem

To: Bob Leaver <>
Subject: Re: [TR] fast idle problem
From: Jack McGahey <>
Date: Tue, 12 May 2020 20:54:33 -0400
References: <>
I doubt very seriously that your shaft bushings are leaking enough air to 
maintain a 1500 rpm idle  - the shafts would have to be REALLY loose in their 
bushings and youâ??d probably notice - probably the butterflies are not closing 
completely as the should be if youâ??ve backed the idle screws out all the way 
as your post implies you have - You can start by disconnecting the throttle 
linkage from the carbs - then, if the butterflies close and drop the idle to 
zero, you can work backwards to see what about the linkage is holding them open.

If you need shafts and bushings anyway, Iâ??d forget buying a reamer - Joe 
Curto will do all the machining and replace the bushings and shafts in both 
carbs for $150 plus shipping both ways.

Jack Mc

Sent from my iPad

> On May 12, 2020, at 6:27 PM, Bob Leaver <> wrote:
> 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
> ** **
> Donate:
> Archive:
> Unsubscribe/Manage: 

** **


<Prev in Thread] Current Thread [Next in Thread>