Operation - McCulloch MT 250 LK Operator's Manual

OPERATION

WARNING:
Be sure to read the fuel
information in the safety rules before you be-
gin. If you do not understand the safety rules,
do not attempt to fuel your unit. Contact an
authorized service dealer.
FUELING ENGINE
WARNING:
Remove fuel cap slowly
when refueling.
This engine is certified to operate on un-
leaded petrol. Before operation, petrol must
be mixed with a good quality 2- -cycle air- -
cooled engine oil designed to be mixed at a
ratio of 40:1. A 40:1 ratio is obtained by mixing
5 liters of unleaded petrol with 125 ml of oil.
DO NOT USE automotive oil or marine oil.
These oils will cause engine damage. When
mixing fuel, follow instructions printed on oil
container. Once oil is added to petrol, shake
container momentarily to assure that the fuel
is thoroughly mixed. Always read and follow
the safety rules relating to fuel before fueling
your unit.
MIXING RATIO
Petrol - - Litre Two- - Stroke Oil - - ml
40:1 (2.5%)
2 50
5 125
10 250
CAUTION:
Never use straight petrol in your
unit. This will cause permanent engine dam-
age.
FUEL REQUIREMENTS
Use good quality unleaded petrol. The lowest
recommended octane grade is 90 (RON).
IMPORTANT
Use of alcohol blended fuels (more than 10% al-
cohol) can cause major engine performance
and durability problems.
WARNING:
Incorrect use of fuel and/
or lubricants will cause problems such as:
overheating, vapor lock, power loss, lubr-
ication deficiency, deterioration of fuel
lines, gaskets and internal carburetor com-
ponents, etc. Alcohol blended fuels will
cause a high absorption of moisture in the
fuel/oil mixture, causing the separation of
oil and fuel.
HOW TO STOP YOUR UNIT
S To stop the engine, move the ON/STOP
switch to the STOP position.
Starting Position
HOW TO START YOUR UNIT
WARNING:
The trimmer head will
turn while starting the engine. Avoid any con-
tact with the muffler. A hot muffler can cause
serious burns.
STARTING A COLD ENGINE (or a
warm engine after running out of
fuel)
1. Set unit on a flat surface.
2. Move ON/STOP switch to the RUN posi-
tion.
3. Slowly press the primer bulb 6 times.
4. Move choke lever to FULL CHOKE posi-
tion.
5. Squeeze and hold trigger through all re-
maining steps.
Primer
Bulb
Choke
Lever
Starter Handle
Thottle
Trigger
FULL
HALF
RUN
CHOKE CHOKE
6
CARBURETOR 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.
STORAGE
WARNING:
Perform the following
steps after each use:
S Allow engine to cool before storing or trans-
porting.
S Store unit and fuel in a well ventilated area
where fuel vapors cannot reach sparks or
open flames from water heaters, electric
motors or switches, furnaces, etc.
S Empty fuel tank before storing or transport-
ing the unit.
S Store unit and fuel well out of the reach of
children.
S Store unit with all guards in place. Position
unit so that any sharp object cannot acci-
dentally cause injury.
SEASONAL STORAGE
Prepare unit for storage at end of season or if
it will not be used for 30 days or more.
If your unit is to be stored for a period of time:
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 adjust-
ments. Keep all parts of your body away from
the cutting attachment and muffler.
Idle Speed Adjustment
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.
Idle Speed Screw
Air Filter Cover
If you require further assistance or are unsure
about performing this procedure, contact an
authorized service dealer.
S Clean the entire unit before lengthy storage.
S Store in a clean dry area.
S Lightly oil external metal surfaces.
ENGINE
S Remove spark plug and pour 1 teaspoon of
40:1, 2-cycle engine oil (air cooled) through
the spark plug opening. Slowly pull the
starter rope 8 to 10 times to distribute oil.
S Replace spark plug with new one of recom-
mended type and heat range.
S Clean air filter.
S Check entire unit for loose screws, nuts,
and bolts. Replace any damaged, broken,
or worn parts.
S At the beginning of the next season, use
only fresh fuel having the proper petrol to oil
ratio.
OTHER
S Do not store petrol from one season to
another.
S Replace your petrol can if it starts to rust.
11