2.
Start the engine and allow
it
to warm up tho-
roughly (at least
10
minutes).
\
Some equipment manufacturers may require
higher throttle stop speed and governor low
speed rpm settings. Referto equipment manufac-
turer’s Operators Manual for the correct rpm set-
tings. When rpm settings are not specified by the
equipment manufacturer, use the rpm settings
listed in Steps
3
&
5.
3.
Move the engine speed control to the slow posi-
tion. Bend or turn the low speed stop on the gov-
ernor
so
that the throttle stop screw on the car-
buretor controls enginespeed. Adjust the throttle
stop screw for
1000
rpm idle.
ADJUSTMENT
FS-1002
WALBRO CARBURETOR
4.
Determine the best idle mixture setting by first
turning the idle adjustment screw in until engine
speed drops and then outward until engine speed
two settings, engine speed remains at its highest.
limited adjustment idle mixture carburetor adjust-
ments are limited to
fl/8
turn. Do not
go
beyond
these limits.
drops again. Over a narrow range between these
Set the adjustment screw about
1
/8
turn outward
(rich) from the midpoint
of
this range. On Nikki
THROTTLE
SZEw
\
LOCATION
OF
OPTIONAL MAIN
FUEL ADJUSTMENT
IDLE FUEL
ADJUSTMENT
FS-1406
NlKKl CARBURETOR
5.
Readjust the throttlestop screw for
1000
rpm idle,
then adjust the governor low speed stop for
1100
rpm idle.
.
6.
Move the engine speed control
to
the fast posi-
tion. Bend the high speed stop on the governor
so
the engine runs at the equipment manufacturer’s
recommended speed.
7.
Checkthe main mixtureadjustment (if
so
equipped)
by rapidly accelerating the engine from idle to full
speed. The engine should accelerate evenly and
without hesitation.
If
it
does not. turn the main
FS-1406-2
adjustment screw out in
1
/8
turn increments until
the engine accelerates smoothly, but do not turn
it
NlKKl CARBURETOR WITH SEMI-AUTOMATIC CHOKE
AND LIMITED IDLE
MIXTURE
SCREW.
out more than
1
/2
turn beyond the original setting.
FIGURE
2.
CARBURETOR
ADJUSTMENTS
7-2
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