McCulloch MAC 291 - TROUBLESHOOTING THE ENGINE

PROBLEM
PROBABLE
CAUSE
CORRECTIVE
ACTION
Unit
won't
start
or starts
but
will
not
run.
I
ncorrect
starti
ng
Procedures
Follow
instructions
in
the User
Manual
(See
Section
6).
lncorrect
carburetor
mixture
adjustment
setting
Have
carburetor
adiusted
bY
an
Authorized
Service
Center.
Fouled
spark
plug
Remove,
clean
and
gaP (or rePlace)
spark
plug.
lf
plug is
wet, reinstall
plug
and
hold at
full
throttle
until
unit
starts.
lf
plug
is dry,
try
starting
with
choke
on
(See
Section
8).
Fuelfilter
plugged
Replace
fuelfilter
(See Section
B)'
Unit
starts,
but engine
has
low
power.
Incorrect
lever
position
on
choke
Move
to
RUN
position.
Dirty
spark
arrestor
screen
Replace
spark
arrester
screen.
Dirty
air
filter
Remove,
clean
and
reinstall
filter.
lncorrect
carburetor
mixture
adjustment
setting
Have
carburetor
adiusted
bY
Authorized
Service
Center.
an
Engine
hesitates
lncorrect
carburetor
mixture
adjustment
setting
Have
carburetor
adjusted
bY an
Authorized
Service
Center.
No
power
under
load
Runs erratically
Incorrectly
gapped
spark
Plug
Clean
/
gap
or replace
Plug.
Smokes
excessivelY
lncorrect
carburetor
mixture
adjustment
setting
Have
carburetor
adiusted
bY
Authorized
Service
Center.
an
lncorrect
fuel
mixture
Use
properly
mixed
fuel
(40:1
mixture)
.
FOR
WARRANW
OR
SERVICE
CONTACT
THE
NEAREST
MCCULLOCH
AUTHORIZED
SERVICE
CENTER
LISTED
UNDER
''SAWS'
IN
YOUR
TELEPHONE
DIRECTORY
YELLOW
PAGES.
IF
FURTHER
ASSISTANCE
IS
REQUIRED
CALL
THIS
TOLL-FREE
HOT
LINE'
PLEASE
REFERENCE
YOUR
MODEL
AND
SERIAL
NUMBER'
1€00423-6302
ln
Arizona:
1-800-221-6s07
M-F
6:00
AM
-
4:45
PM
(MST)