Fig. 4- 31
Fig.
4
-32
/
Fast idle
od1~11ng
sc
r
ew
Fig.
4
-33
Fig.4-34
4
4-
A-6.
Checking Secondary Throttle Valve
1. The secondary throttle valve starts
to
open when
the primary throttle valve opens 52
±
2 degrees and
completely opens
at
the same time when the primary
throttle valve fully opens.
2. Check the clearance between the primary throttle
valve and the wall
of
the throttle bore when the
secondary
throttle
valve starts
to
open.
3.
lf
the clearance is not within the specification, bend
the throttle
arm
until the proper clearance is
obtained.
Standard clearance
6.2
...,
7.2
mm
(0.244 - 0
.2
83
in)
4-A-7.
Installing
Carburetor
Install the carburetor in the reverse order
of
removing.
After
installing,
note
the
followings.
a) Start the engine
and check for leaks.
b) With the engine operating, check the fuel level.
The fuel level should be in the specified mark in
the sight glass.
c)
Make the idle adjustment as instructed
in
Par.
4-A-8.
d)
After idle adjustment is completed, check the fast
idle speed as follows.
I .
Fully depress the accelerator pedal.
2. Warm
up
the engine
to
normal operati
ng
temperature.
3.
Stop
engine and remove the air cleaner.
4.
While
holding the throttle valve slightly open, push
the choke valve to fully close
it,
and release the
choke valve after releasing the throttle valve.
5.
Start
engine,
but
do not touch accelerator pedal.
6.
Check
to see
that
the engine speed increases to
3,000 - 4,000
rpm.
Tf
the engine speed
is
not
within the specification
tum
the fast idle adjusting screw.
4-A-8.
Adjusting
Idle Speed
and
Idle
Mixture
Precheck:
Be
sure the ignition timing, spark plugs, carburetor
float
level and etc., are in normal condition.
Preconditions
for
idle
adjustment
1.
Apply the parking brake and block the wheels.
2.
Tum
off
all lights and other unnecessary electrical
loads.
4:
10
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