Idle Speed Adjustment; Mixture Adjustment - Craftsman 358.796921 Operator's Manual

IGNITION SWITCH
ON
OFF
THROTTLE CONTROL
Figure 3 Figure 4
IIII II I II I IIIIIlU IIII II
CHOKE KNOB
/ (HALF
/
/ POSITION)
OFF ]
Figure 5
D. CARBURETOR ADJUSTMENTS
91) r
Poor engine performance can be a result of other
causes such as dirty air filter, carbon build-up on
muffler outlets, etc. See "Trouble Shooting Chart"
before proceeding with carburetor adjustments.
• The'carburetor has been carefully adjusted at the
factow. Due to changes in altitude and operating
conditions,your carburetor may require adjusting.To
make the adjustment follow the procedure below
very carefully,
1. PREPARATION
a.) Use fresh fuel mix. See "Fueling Your Engine:'
b.) Remove air filter. See Figure 8.
c,) Turn Mixture Screw (Figure 6) clockwise
until fully closed, but do not overtighten. Figure
6. Unscrew mixture screw one full turn
counterclockwise _ .
d.)Turn Idle Speed Screw (Figure 6) clockwise
until it stops, do not ovetighten. Open
screw three full turns counterclockwise 4[-=_.
Figure 6
IDLE SPEED
ADJUSTMENI
SCREW
/
2. IDLE SPEED ADJUSTMENT
a.) Start the engine and turn throttle control to
halfway between "Fast" and "Slow".
b.) Operate the unitfor 3 minutesto warm up engine.
c.) Turn throttle control counterclockwise
41--,,, to slow setting.
d.) Adjust the Idle Speed Screw until the engine
idles as slow as possible without the engine
stalling.
Turn screw clockwise _ if the engine
stalls.
-- Turn screw counterclockwise _ to slow
engine
down,
I CAUTION: t The mixture setting is a highly
critical adjustment. If set incorrectly, perma-
nent damage will occur to the engine. Do not
operate engine at fast throttle for prolonged
periods while making the mixture adjust-
ment. The mixture screw should be in the
range of 3/4 to 1-1/4 turns open.
3. MIXTURE ADJUSTMENT:
a.) Adjust throttle knob to "Fast" position.
b.) Turn the Mixture Screw slowly clockwise
until the engine speed is reduced.
Note position.
c.) Turn the screw slowly counterclockwise
. Stop when the engine just begins
to run roughly,
d.) Turn the screw slowly the minimum amount
clockwise _ until the engine runs
smoothly.
e.)Reinstall A_f Fdter.
[CAUTION:t The air filter must be fitted into
the corners of thehousing and under the
center tab to avoid engine damage.
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