David -
I don't have an HS4 in front of me, but fast idle adjustment on most
SU carbs consists of a little lever attached to the throttle shaft
itself with a screw on it...typically if you screw it down it opens
the throttle slightly, and screw it up it shuts it off. The screw
will typically touch another lever or cam that is connected to your
carb's choke mechanism. This is a picture (third picture down) which
shows where it is on an HS4 for an MGB, for the healey it might be in
a slightly different place:
http://www.mgdriversclub.com/tech/tuning-su-carburetors.html
Just for your own understanding... the fast idle screw should not open
the throttle any until the choke is engaged... you set standard idle
using the throttle stop screw on an HS carb... which is seperate from
the fast idle screw.
Good Luck!
Alan
'53 BN1 '64 BJ8
On 7/10/05, davidwjones <davidwjones@cox.net> wrote:
> OK, I have about eight different documents describing the setup and adjustment
> of the triple HS4s.... Mixture, throttle, synchronization....etc.
> All of these references point out the FAST IDLE adjustment, but none says ONE
> WORD on how to set it. Can someone confirm for me how these are properly set?
> --Current "breaking down under load" problem has me questioning
> everything....
> Thanks,
> David W. Jones
> '62 Mk II BT7 tricarb
> Cumberland, RI USA
|