Ned -
If the butterfly valve on the throttle shaft (i.e. the round brass throttle
plate) is not properly seated in the fully closed position, you will get
this problem because air is leaking past the throttle plate even when it is
fully closed.
You have to remove the carbs and then loosen (don't remove) the two flat
head screws that hold the throttle plate in place, so that the throttle
plate can be adjusted. Then close the throttle and make sure the throttle
plate is fully secured in the closed position inside the throat body (it
should be air tight around the edges of the plate)... then tighten the two
screws.
Put the carbs back on and voila it will work correctly now. Don't fret,
putting my mind to it I can have BJ8 carbs off the car, adjusted, and back
in within 1 hour. GIT 'ER DUN!!
Cheers,
Alan
'52 A90
'53 BN1
'64 BJ8
On 9/3/06, Ned Smith <smithn00@kitepilot.net> wrote:
>
> I am following Steve Byers excellent instructions for tuning the carbs and
> I've run into a snag. Turning the Idle Mixture Adjusting Screw either in
> or
> out by a full turn doesn't seem to change the idle speed or affect the air
> flow through the throats.
>
> Does this indicate a carb problem? The engine seems to runs well in any
> event.
>
>
>
> Ned Smith
>
> BJ8
>
> near Chattanooga, TN
>
> N34.98 W85.5
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