FUEL
Fuel system
4-15
62Y5A11
4. Adjust the idle speed to 1,000 r/min by
turning the throttle stop screw
4
on car-
buretor #4 in direction
a
or
b
.
NOTE:
• To increase idle speed, turn the throttle
stop screw in direction
a
.
• To decrease idle speed, turn the throttle
stop screw in direction
b
.
5. Measure the vacuum pressure of carbu-
retor #4.
6. Turn the throttle valve adjusting screws
5
to adjust the vacuum pressure of car-
buretors #1, #2, and #3 to the same vac-
uum variation as carburetor #4.
7. Adjust the engine idle speed to specifica-
tion.
8. After adjusting the idle speed, rev the
engine a few times and let it idle for at
least 15 seconds to check that the vac-
uum pressures stay within 50 mm Hg
(67 m bar, 1.97 in Hg) and to check the
stability of the engine.
Adjusting the dash-pot
(acceleration pump)
1. Start the engine and warm it up for 5 min-
utes, and then check the engine speed at
the operation point of the dash-pot.
2. Attach the special service tool to high-
tension cord #1
1
.
Vacuum gauge (digital)
(commercially obtainable)
3
:
Vacuum gauge (4 analog meters)
(commercially obtainable)
4
:
Vacuum gauge adaptor
(commercially obtainable)
5
:
Engine idle speed: 850–950 r/min
S62Y4430
1
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