Care And Maintenance; Air Filter And Carburetor; Carburetor Adjustments - Sears CRAFTSMAN 358.350870 Owner's Manual

CARE AND MAINTENANCE
Model. 358-350842 (Craftsman 2.1) Model 358.350870 (Craftsman 2.1 PS) Model 358.350880(Craftsman 2.3 PS/VL)
Follow these helpful hints on care and maintenance to
get the best possible service from your saw, to prevent
major breakdown and costly repair bills. Careful servicing
of your saw is one of the most important steps in preven-
AIR Fi LTER AND CARBURETOR
To clean the air filter or adjust the carburetor, loosen the
filter cover screw (ahead of choke knob) and remove it
and the air filter cover. The air filter element should be
removed after evew 10 hours use and rinsed out in gaso-
line or fue! and oil mix. Squeeze it out well and be sure
the filter element fits into the cavity neatly without folds,
and flush with the top surface. See figure 6. Allow filter
element to dry before restarting engine or mixture will be
too rich;
CARBURETOR ADJUSTMENTS
General:
Carburetor adjustments are made at our factory and wil|
be correct for most app ications. Further adjustments may
be required due to altitudes above 4000 ft., brands!age of
fuel used, and atmospheric conditions.
Caution:
The needles and associated parts will be damaged if Over-
tightened.
Adjustments:
Step 1. (Refer to Figure 7) -- Remove carburetor cover,
Turn high speed and low speed needles clockwise until
they stop, Remember! Don't Over-Tighten.
Step 2. Turn high and low speed needles counterclock-
wise one full turn.
Step 3. Start engine in the same manner as described on
page 3 under "Starting and Stopping". The chain saw
engine should be run four or five minutes to bring it to
operating temperature.
Step 4. (Low Speed Needle Adjustmeht) " Squeeze the
throttle trigger and hold it in for five or six seconds. This
should clear the combustion chamber of built up fuels.
StepS. Squeeze throttle trigger .quickly. The engine
should accelerate smoothly. If it does not, turn low speed
needle counterclockwise 1/16 of a turn and squeeze
throttle quickly again. Continue turning tow speed screw
1/16 of a turn at a time until smooth acceleration is ac-
complished.
Step6. (High Speed Needle Adjustment) -Squeeze
throttle trigger all the way in. Test cut a piece of wood.
Step 7. If engine speed begins to fade, turn high speed
needle counterclockwise 1/16 of aturn and make anoth'er
test cut. Continue this until fading is corrected.
Step 8. If there is an excessive amount of smoke in the
exhaust, turn high speed needle 1/16 of a turn clockwise
until excessive smoke is reduced. .........
Step 9. (Idle Speed Adjustment) -- Turn the idle speed
screw (Figure 7) clockwise until the chain beginsto move.
Now slowly turn idle speed screw counterclockwise until
chain stops moving.
"live maintenance. Shoutct your saw develop trouble that
_, you are not prepared to handle, take it to a Sears Store
for service.
Fig. 6
Needle
Idle Speed Low Speed
Screw Needle
Fig. 7
PLEASE NOTE: Observe "Rules For Safe Operation"
when adjusting carburetor.
TO adiust the high speed needle, first make a test cut with
the saw; If the engine power seems to fade in the cut, the
mixture is set too lean. Remove the saw from the cut. The"
high needle should be tu rned counterclockwise slightly. If
there seems to !_e an excessive amount of smoke in the
exhaust, the mixture is set too rich. Remove the saw from
the cut. The high speed needle should be turned clockwise
slightly. After each adjustment make a testcut to check
performance. :....
Fig. 8
4