CARBURET
OR
ADJ U
STNilENT
fr
The carburetor was adjusted at
the factory.
lt is
seldom
necessary to make
major
adjustments.
Minor
"triming"
is all that is usually
necessary. Discourage all
persons
from
turning
the
adjustment
needles experimentally.
Ad-
justing
the carburetor
cannot restore
performance
lost
because
of
low compression,
poor
spark, or
faulty fuel
defivery or air intake. In any evenl,
always
be sure the
air
filter is clean,
belore
you
make any carburetor adiust-
ments.
ADJUSTMENT
IF
ENGINE
CANNOT
BE
STARTED
With a small screwdriver,
turn the Hl and
LO mixture
adjustment needles slowly
clockwise until
both
are
gently
seated.
(Careful!
Forcing
needle
into seat can
rende-r carburetor
unadjustable, requiring
caburetor
replaiement.)
Then turri the Ht
ireedle ou-i 1 full turn
and the
LO needle
3/+
lurn.
Latch the
trigger for starting, and
lololw instructions
lo start
the saw. Unlatch
the trigger to let
the
saw
idle. CAUTION: GHAIN
WILL TURN WHEN ENGINE
STARTS
AND MAY NOT STOP WHEN ENGINE
IS
IDLED.
3. lf chain
turns al idle throttle, turn
lhe idle speed
screw
slowly counterclockwise until
the chain stops.
Now
make linal adjustments as
instructed below.
ADJUSTMENTS
AFTER ENGINE
IS AT
OPERATING
TEMPERATURE
1.
Run the saw
for a few
minules to
get
the engine
warm,
then idle the engine
and do the lollowing:
a)
Turn the idle speed
sclew clockwise
until the
chain begins
to turn. Note
this
screw
setting.
+ts+
*
b)
Turn the
idle speed
screw in the
other
direction
until the
engine
starts to
falter.
Note
this screw
'
setting.
c) Set
the
idle speed
screw
midway between the set-
ings noted
in a) and b).
2. ADJUST
FOR PROPER
IDLE:
Adiustment
ol
both
the
LOrcedte
and
the
idle speed screw
are required for
iiFe tuning
of the
iiiiiltiir5TThEl,o
needie slowly
in one
direction,
then in the
other, to find where
the
engine
idles the
fastest on
this temporary setting
of
th;idle
speed
sciffiNOw,
il this speed-is
fastei or
slower
than
desired:
if so fast thal the
chain turns'
or so slow that
lhe
engine falters, change
the idle
speed
by readjusting
the idle speed
screw.
THEN,
readjust the
LO needle
for
lhe
fastest
idling at
!!!9
idte
speed screw
setting.
NOTE:
for
line tuning, lhis
sequence
may
need to be repeated
several limes.
3, ADJUST
Hl NEEDLE
FOR
MAIN OPERATION:
With
bar and
chain clear
of all obstacles,
turn the Hl needle
clockwise until
the saw cannot
accelerate
flom idle
to wide
open
throttle at
no
load. Now
turn the
Hl
needle
the other
way,
a
little at a
time, until the
en-
gine
accelerates
smoothly
lrom
idle
to wide open
throttle
without a
cutting
load.
IMPORTANT:
Frqn
this
point,turntheltffittanother
th
turn oo*s
clockwise.
IDLE
SPEED SCREW
1.
The air filter
should be removed
and cleaned
twice each
day
of operation, or
more
frequently if extremely
diriy
operating
condilions
are encountered.
A dirty lilter
causes
saw
to run excessively
rich,
smoking exces-
sively, using
luel at a
fast rate
and
lacking
in
power.
Never
attempt
carburetor
adiustment
until
the air filter
has
been checked
and cleaned
or replaced.
1.
Remove air
intake
cover
(left
rear side
of saw)
by
taking
out
the cover
mounting screw.
Glean sawdust
from air
intake area ol
saw belore
removing
the filter.
2. Clean
filter by
tapping
it
against
a
clean surface. Oc-
casionally,
give
it a
thorough
cleaning
in a
non'oily
cleaning
solvent and
let it dry befote
further use.
Filters do
not cost
much so
you
may
lind it
practical
to keep
a
few
spares
on
hand
lor instant
changing.
3.
Cleaning
does
not remove
all dirt
particles
lrom the
filter
pores.
Therefore,
replace
the lilter after
several
months of
use or
more than
30 cleanings'
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