[Healeys] slow idle setting

[Wilko2]

Black smoke and fast means you're too rich with the mix.

With the idle screws only open a tiny bit, I'd guess that your throttle shafts
(or something else is leaking). Check to make sure your throttle plates are
seating well and adjust return springs if necc.

Check choke levers for proper motion-there are two active positions. One
lowers the main jet for richer mixture, then a little more opens some
throttle. If your choke is sticking open, you'll mix too rich particularly at
idle.

BTW, 800 is a perfectly good idle speed for a Healey.

Wilko


On Apr 9, 2014, at 2:56 PM, Richard Kahn wrote:

> I was trying to adjust and balance my HD8s and I cannot figure out the slow
> idle.   I am at 6500 ft elevation and the idle is at 800 RPM. When I drive
at
> lower altitudes the slow idle goes to 1000 to 1200 RPM.  Not a problem as
the
> BJ8 runs very well. Yesterday, I tried the "cook book" tuning method. When
I
> close the slow idle screws then open them 2 1/2 turns the idle is high and
I
> get black smoke. I turned the screws evenly a half turn at a time until the
> RPM went down as low as it would go but the best I could get is 800 RPM.
The
> screws are now only 1/2 turn open. Again it runs fine. What is going on? I
am
> running the timing a little advanced on purpose. Carbs are balanced and I
use
> two Colortunes to set the fuel mixture. I will be doing a lot of lower
> altitude driving this year and was hoping to get this worked out if I can.