Fuel
System
CARBURETOR
(Does
not
Apply
to
Spec
G
and
Later)
All
carburetors have a fixed main jet. An optional fixed
main jet is available for altitude compensation above
5,000
feet.
The carburetor idle mixture was set for maximum
efficiency at the factory and should normally not be
disturbed.
If
adjustments seem necessary, first be sure
the ignition system is working properly and governor
sensitivity is properly adjusted.
The carburetor has a limited adjustment range between
stops of +1/8 turn. The screw should only be adjusted
within these limits; in
to
lean the mixture, out
to
richen.
-1
Ovetfightening the mixfureadjusfment
screw
wi//
cause carburetor damage.
Turn mixture adjustment screw
in
on/y
unfil
right
tension
can be felt.
If
replacing idle mixture screw, turn in until lightly
seated, then turn screw back
out
1-1 /4 turns for the
P216, P218, and P220 carburetors, and 1-1
/2
turns for
the P224 carburetor. Replace limiter cap with the plastic
stop approximately centered.
ADJUSTMENT
SCREW
FS-1000
SIDE PULL GOVERNOR ASSEMBLY
Carburetor
Speed
Settings
(at
least
10
minutes).
1.
Start the engine and allow it to warm up thoroughly
Some equipment manufacturers may require higher
throttle stop speed and governor
low
speed rpm
settings. Refer
to
equipment manufacturer’s Oper-
ator’s Manual for the correct rpm settings. When
rpm settings are not specified by the equipment
manufacturer, use the rpm settings listed in Steps
2
and
3.
2.
Move the engine speed control
to
the slow position.
Bend or turn the low speed
stop
on the governor
so
the
throttle stop screw
on
the carburetor controls
engine speed. Adjust the throttle stop screw for
1000
rpm idle (Figures
1
and 2).
3.
Adjust the governor low speed stop for 1100 rpm
idle.
4.
Move the engine speed control to the fast position.
Bend the high speed stop
on
the governor
so
the
engine runs at the equipment manufacturer’s
recommended speed.
LOW
SPEED
-
\
STOP
M-13964
FRONT
PULL
GOVERNOR ASSEMBLY
FIGURE
1.
GOVERNOR SPEED ADJUSTMENT
7-1