Weed Eater SST25C - Manual (Page 10)

10
REPLACE SPARK PLUG
Replace the spark plug each year to ensure
the engine starts easier and runs better. Set
spark plug gap at 0.025 inch (0.6 mm). Igni-
tion timing is fixed and nonadjustable.
1. Twist, then pull off spark plug boot.
2. Remove spark plug from cylinder and dis-
card.
3. Replace with Champion RCJ-6Y spark
plug and tighten securely with a 3/4 inch
(19 mm) socket wrench.
4. Reinstall the spark plug boot.
SERVICE AND ADJUSTMENTS
LINE REPLACEMENT
For unit to operate properly, the cutting line
should be replaced when line becomes worn
to less than 3 inches in length from the edge of
each side of the cutting head.
WARNING:
Use only 0.095 inch (2.4
mm) diameter WEED EATER brand cut length
line. Never use wire, rope, string, etc., which
can break off and become a dangerous mis-
sile.
1. Remove and discard worn line before
installing new line.
2. Clean entire surface of cutting head.
3. Insert ends of line into the two guide holes
on front of cutting head.
Guide
Hole
Guide
Hole
4. Continue to feed line through the guide
holes until the line is fully extended
through the side exit holes.
Side Exit Hole
Side Exit
Hole
5. Pull ends of line until line is tight. Correctly
installed line will be the same length on
both ends.
REPLACING THE CUTTING HEAD
1. Align hole in the dust cup with the hole in the
side of the gearbox by rotating the dust cup.
2. Insert a small screwdriver into aligned
holes. This will keep the shaft from turning
while removing and installing trimmer head.
Screwdriver
3. While holding the screwdriver in position,
remove trimmer head by turning clockwise
(looking from bottom of unit).
4. Thread replacement trimmer head onto the
shaft by turning counterclockwise. Tighten
until secure.
5. Remove the screwdriver.
CARBURETOR IDLE SPEED
ADJUSTMENT
WARNING:
Keep others away when
making idle speed adjustments. The trimmer
head will be spinning during this procedure.
Wear your protective equipment and observe
all safety precautions.
The carburetor has been carefully set at the
factory. Adjustments may be necessary if you
notice any of the following conditions:
S
Engine will not idle when the throttle is re-
leased.
Make adjustments with the unit supported so
the cutting attachment is off the ground and
will not make contact with any object. Hold
the unit by hand while running and making ad-
justments. Keep all parts of your body away
from the cutting attachment and muffler.
To adjust idle speed:
Allow engine to idle. Adjust speed until engine
runs without stalling (idle speed too slow).
S
Turn idle speed screw clockwise to in-
crease engine speed if engine stalls or dies.
S Turn idle speed screw counterclockwise to
decrease engine speed.