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1468
CARBURETOR-AFB
(4) Turn each idle mixture adjusting screw in the
clockwise direction (leaner) until there is a slight drop
in r.p.m. Now, turn each screw out, counterclockwise
(richer) just enough to regain the lost r.p.m.
This procedure will assure that the idle has been
set
to the leanest possible mixture for smooth idle.
This setting i s very important.
Since the correct speed was originally set using
the speed screw, or by-pass idle air bleed screw, the
speed obtained after finding the leanest smooth idle
setting will probably be too fast.
(5) Readjust the speed screw or bypass idle air
bleed screw to obtain the correct idle speed. Repeat
steps
2
and
4
above if necessary.
NOTE: After the proper idle speed has been
ob-
tained refer to Figure in the Throttle Linkage Sec-
tion of this Group for the procedure on adjusting
the transmission control rod.
Fast
Idle Speed
(On
the vehicle)*
To set the fast idle speed on the car, connect a ta-
chometer to the vehicle, then set the curb idle speed
and proceed as follows:
(1) With the engine running and the transmission
in the neutral position, open the throttle slightly.
(2)
Close the choke valve about 20 degrees, then
allow the throttle to close. Return the choke valve to
the wide open position.
(3) The fast idle speed adjusting screw should be
contacting the slowest speed step on the fast idle
cam, as shown in (Fig. 21).
(4)
With the engine warmed-up to the normal
op-
erating temperature, turn the fast idle speed adjust-
ing screw
in
or
out
to secure
700
r.p.m.
Reposition
the cam and throttle after every fast idle speed screw
adjustment to apply normal throttle closing torque.
*After Approx.
500
Miles (Minimum Break In Pe-
riod).
NK329
Fig.
I--Throttle
linkage Adjustment lModel AP-2 with
318-383
or 426
Cu.
In. Eng.1
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