Craftsman 316.79187 - Manual (Page 10)

10
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the air
filter/muffler cover (Fig. 20).
NOTE: Careless adjustments can seriously damage your unit.
Contact a Sears or other qualified service dealer to make
carburetor adjustments. Call 1-800-4-MY-HOME
® for
more information.
Check Fuel Mixture
Old and/or improperly mixed fuel is usually the reason for
improper unit performance. Drain and refill the tank with fresh,
properly-mixed fuel prior to making any adjustments. Refer to
Oil and Fuel Information (p. 6).
Clean Air Filter
The condition of the air filter is important to the operation of the
unit. A dirty air filter will restrict air flow and change the air/fuel
mixture. This is often mistaken for an out of adjustment
carburetor. Check the condition of the air filter before adjusting
the idle speed screw. Refer to Air Filter Maintenance (p. 9).
WARNING: If the spark arrestor hood and spark
arrestor screen are not tightened securely, they could
fall off causing damage to the unit and possible
serious personal injury.
4. Clean the spark arrestor screen with a wire brush. Replace it
if it is damaged, or if you are unable to clean it thoroughly.
5. Reinstall the spark arrestor screen by putting the “raised” portion
of the screen inside the recessed hole of the muffler. Make sure
that the spark arrestor screen fits flat against the muffler.
6. Place the spark arrestor plate on top of the spark arrestor screen
with the raised side up and the opening facing toward the engine
(Fig. 19)
7. Place the spark arrestor hood on top of the spark arrestor
plate with the “raised” side up and the opening facing AWAY
from the engine (Fig. 19). Verify that the exhaust will be
directed AWAY from the engine.
8. Replace the screw you removed in Step 2 and tighten securely.
9. Reinstall the air filter/muffler cover (Fig. 14).
MAINTENANCE & REPAIR INSTRUCTIONS
6. Replace the air filter inside the air filter/muffler cover (Fig. 15).
NOTE:
Operating the unit without the air filter and air
filter/muffler cover assembly will VOID the warranty.
Reinstalling the Air Filter/Muffler Cover
1. Place the air filter/muffler cover over the back of the
carburetor and muffler. Align the screw holes.
2. Insert the four (4) screws into the holes in the air filter/muffler
cover (Fig. 14) and tighten. Do not over tighten.
SPARK ARRESTOR MAINTENANCE
NOTE: Pay close attention when disassembling the muffler so
you can put it back together correctly. Failure to do so will
damage the unit and may cause serious personal injury.
1. Remove air filter/muffler cover. Refer to Removing the Air
Filter/Muffler Cover (p. 9).
2. Locate the muffler, but do not remove it. Find the screw on
the bottom of
the muffler (Fig.
19). This screw
holds the Spark
Arrestor Hood
Assembly and
the spark
arrestor screen
to the bottom of
the muffler.
Remove this
screw using
either a Torx
T20 or flat blade screwdriver.
3. Using a small flat blade screwdriver, carefully pry up the
spark arrestor screen from the recessed hole, taking care to
notice that the “raised” part of the spark arrestor screen is
inside the recessed hole. Remove the spark arrestor screen
from the muffler.
Fig. 19
Spark Arrestor
Screen
Spark Arrestor
Hood
Screw
Muffler
To Engine
Tabs
Slots
Fig. 15 Fig. 16
Air Filter
Inside Muffler
Cover
Fig. 17 Fig. 18
Idle
Speed
Screw
Fig. 20