T TO
AIR FILTER MAINTENANCE
CASTING, THEN SNAP INTO PLACE
To Inspect and Clean or Change
the Air Filter
1. Refer to the illustrations. Use the slot at the top of the
The spongy element removes dirt from the air. When it
back plastic filter cover to pry off the cover.
clogs up, the saw will smoke excessively and lose power.
2.
Clean the area around the filter before removing filter.
The filter should be changed when dirty, but in an emer-
gency, can be cleaned in detergent and water or a
clean-
3.
Fit clean filter in place carefully.
ing solvent and allowed to dry. The normal life
expec-
4.
Before operating, reinstall plastic cover as follows:
tancy of the element is
lot015 hours of operation. How-
Start cover on by putting choke lever through the slot
ever, extremely dirty operating conditions may cause the
and placing tabbed bottom and rear edges into
posi-
filter to clog in four or five hours. You should keep some
tion. Press cover into place. WARNING: Never run the
spares on hand for quick-changing.
engine without the filter.
CARBURETOR ADJUSTMENT
The carburetor isan all-position, diaphragm type having a
factory-calibrated, high-speed mixture system for proper
high speed performance. It has two adjustments which
may require adjustment from time to time to achieve the
desired idling characteristics.
The first adjustment is the idle speed screw. This screw is
used to adjust the idle speed. It does this by holding the
throttle shutter partly open to let fuel and air be drawn
through the carburetor for idling.
The second adjustment is the idle mixture adjustment
needle. This needle adjusts the amount of fuel to get the
correct mixture required for idling.
Always clean or change the air filter before attempting
any carburetor adjustment.
Adjustment for Starting
-
1. No adjustments are required for starting a cold engine
at full throttle (trigger depressed) or for operating.
2.
Adjustment for proper idle speed and mixture may be
required if a hot or warm engine cannot be started at
idle throttle or if the engine idles roughly or refuses
to accelerate.
a) Turn the idle mixture adjustment needle slowly
clockwise until it gently closes against its seat (do
not force). Then open it 1 1/4 turns.
b) Turn the idle speed screw clockwise 1/2 turn at a
time and keep trying to start the engine each time,
until it does start and will keep idling.
Adjustments After Engine Is at
Operating Temperature
The saw should be started up and a few cuts made to warm
it up. Then idle the saw and make the following adjustment:
1. Turn idle mixture needle slowly in one direction, then
the other. Leave set where the engine idles the fastest.
2. If this idle speed is too slow, the engine will falter. Turn
the idle speed screw slowly clockwise to increase the
speed until the engine no longer falters at idle.
3.
If the speed (in Step 1) is so fast that the chain rotates
rapidly, or takes too long to stop rotating after the en-
gine is throttled back to idle, turn the idle speed screw
counterclockwise until the chain stops turning (but no
slower than this setting).
4.
What you have done in the above steps is to adjust the
throttle for the proper idle setting, and then adjust the
mixture for that setting. Any time you adjust the idle
speed, always readjust the idle mixture needle for the
best mixture as in Step 1.
Carburetors of saws which bear this circular sticker
have had the standard circuit plate replaced with a
high altitude plate for optimum performance at high
altitudes.
WARNING
At low altitudes this modification will cause lean
operation and overheating. DO NOT OPERATE SAW
BELOW
5000
FEET UNLESS CARBURETOR CONTAINS
THE STANDARD PLATE. If changing back to standard
plate, remove the high altitude sticker from the saw.
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