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SERVICE AND ADJUSTMENT
HOW TO ADJUST
THE CARBURETOR
Differences
in fuel, temperature,
altitude
or load may require
minor
carburetor
adjustment.
The
air cleaner
and
its cover
must
be
assembled
to carburetor
before starting engine.
The carburetor
on this engine
is equipped
with an idle mixture valve
with a limiter (see inset), which allows
some minor adjustment,
and
an idle speed
adjustment
screw.
1.
To adjust idle speed, start engine
and warm up about 5 minutes.
2.
With engine
running,
put the remote
throttle
control
in SLOW
position.
3.
Rotate
the carburetor
throttle
control
lever
against
the idle
speed
screw
and hold it (see Figure 23). Then,
turn the idle
speed
screw
to obtain
1750 rpm (use a tachometer).
4.
Rotate
the idle mixture
valve
full travel
clockwise
and then
counterclockwise.
NOTE: DO NOT remove limiter caps. DO NOT force beyond
limits.
5.
6.
Then, position idle idle mixture valve in middle of travel.
Move the remote throttle
control
to the FAST position. The
engine should accelerate smoothly. If it does not, adjust the idle
mixture valve counterclockwise
1/8 turn.
NOTE: Engines operated at approximately 3000 to 5000 feet (900
to 1500 meters) above sea level may require a high altitude
carburetor nozzle. If erratic performance is observed, contact a
Sears Service Center for cost to install or to purchase a high
altitude carburetor nozzle.
Throttle
Lever
Idle Speed
Screw
Idle Mixture
Valve With
Limiter
!
Figure 23
F-050607L
27
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