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SERVICE AND ADJUSTMENT
HOW TO ADJUST
THE REMOTE THROTTLE CONTROL
For the best engine performance, set the remote throttle control as
follows.
1. Move the remote throttle control to the FAST position (see
Figure 20).
2. The hole in the governor control lever (located just behind gov-
ernor control plate) must align with the hole in the governor
control plate (see Figure 21).
3. If the two holes do not line up, then loosen the casing clamp
screw and move the governor control rack until the two holes
are aligned.
4. Tighten the casing clamp screw.
5. Check the operation of the throttle. Move the _rottle control to Me
STOP position.
6. The governor control lever must make good contact with stop
switch (if equipped). Readjust if necessary.
IMPORTANT: Do not change the engine governor. If the engine
governor needs an adjustment, go to the nearest Sears Service
Center. They have the equipment and experience to make the
adjustment.
CHOKE
FAST
Remote Throttle
Control
SLOW
Governor Control Lever
Hole In Governor
Control Plate Stop
Figure 20
Governor Control Rack Casing Clamp Screw Figure 21
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 (see Figure 20).
3. Rotate the carburetor throttle control lever against the idle
speed screw and hold it (see Figure 22). 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.
6. 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.
Idle Speed
Screw
Figure 22
5. Then, position idle idle mixture valve in middle of travel.
F-040607L 24
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