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B. IGNITION, COOLING!AND EXHAUST SYSTEMS
,18
D Carbon deposits will build up on exhaust
pods, spark arrestor, •muffler, and spark plug
as the saw is used. All of these parts should
be cleaned at the same time to prevent
engine damage, overheating, loss of power,
and hard starting.
• Clean pads:
--as required
--at least once for each 25-30 hours of op-
eration
1. COOLING AND EXHAUST SYSTEM
• Carbon build-up on the cooling and ex-
haust system can cause the engine to
loose power in a cut.
• Keep the spark arrestor clean at all times.
• Red,ace the sparkari_stor_whenbreaks in _
the:iscreen are found.-
SPARK ARRESTOR
HEATSHIELD
MUFFLER
Figure 43
Figure 44
Figure 45
Items required:
--wire brush
--3/8" wrench
--hardwood stick
a. Disconnect the spark plug.
b. Remove the muffler, baffles, and
screen. Figure 43.
c. Pull the starter rope until the piston
moves far enough to close the exhaust
ports.
d. Scrape the carbon deposits from the
exhaust ports and surrounding exhaust
chamber using a hardwood stick.
Figure44.
ICAUTION:JDo notuse a metall;€ scrap
ing tool as you-: might damage the
piston,
e. Blow out loosened carbon with com-
pressed air.
f. Clean the spark arrestor screen with a
wire brush or replace if breaks in the
:_screen are found.
g. Reassemble muffler parts.
2. SPARK PLUG
• Maintenance is indicated when the engine
is hard tb start.
• Keepthe spark plug:
--clean
--properly gapped (.025")
Items Required: Small brush, such as a
tooth brush, or a pocket knife.
............._ a_,..Remove.the ,carbureto[ cover. _:_ _........
b. Pull the rubber connector from the
spark plug and remove the spark plug
-from the cylinder.
c. Clean deposits from the electrodes of
the spark plug with a small brush or a
pocket knife.
NOTE: Be careful ,when removing,
cleaning, gapping and replacing the
spark_plug. If it is-damaged, it will not
work properly and must be replaced.
d,
e.
f.
Set the gap between the electrodes to
525 using a wire or flat gauge. Figure
Replace the spark plug in the cylinder
and attach the rubber connector.
Replace carburetor cover and knob.
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