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.
Cheers,
Jack Mc
Sent from my iPad
> On May 12, 2020, at 6:27 PM, Bob Leaver <boleaver@gmail.com> 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
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