McCulloch MAC 742 Chainsaw User Manual


 
9
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 0,125
liter of oilwith 5liters of unleaded gasoline. DO
NOT USE automotive or boat oil. These oils
will cause engine damage. When mixing fuel
follow the instructions printed on the container .
Always readand follow t hesafety rulesrelating
to fuel before fueling your unit.
IMPORTANT
Experienceindicates thatalcohol blendedfuels
(called gasohol or using ethanol or methanol)
can attract moisture which leads to separation
and formation of acids during storage. Acidic
gas can damage the fuel system of an engine
while in storage. To avoid engine problems,
empty the fuel system before storage for 30
days orlonger .Drain the gas tank, start theen-
gine and letit run until the fuellines and carbu-
retor are empty. Use fresh fuel next season.
Never use engine or carburetor cleaner prod-
ucts inthefueltank orpermanent damagemay
occur.
CHAIN BRAKE
Ensure chain brake is disengaged by pulling
thefront handguardback towardthe fronthan-
dleas f aras possible.The chainbrake mustbe
disengaged before cutting with the saw.
WARNING: The chain must not
move when the engine runs at idle speed. If
the chain moves atidle speed refer to CAR-
BURETOR ADJUSTMENT within this
manual.Avoid contact with the muffler.Ahot
muffler can cause serious burns.
To stop the engine, move the ON/STOP
switch to the STOP position.
To start the engine, hold the saw firmly on
the ground as illustrated below. Make sure
the chain is free to turn without contacting
any object.
Left Hand
on Front
Handle
Starter Rope Handle
Right Foot Through Rear Handle
Use only 40 --- 45 cm of rope per pull.
Hold saw firmly while pulling starter rope.
IMPORTANT POINTS TO REMEMBER
Whenpullingthestarterrope,donotuse thefull
extentof the rope as this can cause the ropeto
break. Do not letstarter rope snap back. Hold
the handle and let the rope rewind slowly.
Forcold weather starting, startthe unit atfull
choke; allow the engine to warm up before
squeezing the throttle trigger.
NOTE:Donotcut materialwiththechoke/fast
idle le ver at the FULL CHOKE position.
STARTING A COLD ENGINE (or a
warm engine after running out of
fuel)
NOTE
:Inthefollowingsteps,whenthecho-
ke/fast idle lever is pulled out to the full ex-
tent,the correctthrottle settingfor starting is
set automatically.
IGNITION
SWITCH
ON
STOP
Choke
Lever
1. Move ON/STOP switch to the ON posi-
tion.
2. Slowly press primer bulb 6 times.
3. Pull out choke/fast idle to the full extent
(to the FULL CHOKE position).
4. Pull thestarter ropesharply 5 tim eswith
your right hand. Then, proceed to the
next step.
NOTE: If theengine sounds as if it is trying
to start before the 5th pull, stop pulling and
immediately proceed to the next step.
5. Push the choke/fast idle lever in to the
HALF CHOKE position.
OFF
HALF
CHOKE/FAST IDLE LEVER
FULL
6. Pull the starter rope sharply with your
right hand until the engine starts.
7. Allowtheenginetorunforapproximately
30seconds. Then,squeezeandrelease
throttletriggerto allowenginetoreturnto
idle speed.
STARTING A WARM ENGINE
1. Move ON/STOP switch to the ON posi-
tion.
2. Pull the choke/fast idle lever out to the
FULL CHOKE position to set the fast
idle, then push the lever in to the HALF
CHOKE position.
3. Slowly press the primer bulb 6 times.
4. Pull the starter rope sharply with your
right hand until the engine starts.
5. Squeeze and release throttle trigger to
allow engine to return to idle speed.