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MS820
POWER
DISPLACEMENT
BAR LENGTH
TANK CAPACITY
FUEL MIX RATIO
MAXIMUM TEMPERATURE
MAX. ENGINE SPEED
WEIGHT
ASSEMBLY AND OPERATION
INSTRUCTIONS
A standard saw unit package contains as fol-
lows: saw Chain · Guide Bar · Bar protector ·
Power unit · Plug wrench · Screwdriver for car-
buretor adjustment
BAR INSTALLATION
Open the box and install the guide bar and the
saw chain on the power unit as follows:
WARNING: the saw chain has very sharp edg-
es. Use thick protective gloves for safety.
1. Pull the guard towards the front handle to
check that the chain brake is not engaged.
2. Loosen the nuts and remove the chain cover.
3. Gear the chain to the sprocket and while fit-
ting the saw chain around the guide bar, mount
the guide bar to the power unit. Adjust the posi-
tion of the chain tensioner.
NOTE: pay atten-
tion to the correct
direction
of
the
saw chain.
4. Fit the chain cover to the power unit and fas-
ten the nuts to finger tightness.
5. While holding up the tip of the bar adjust the
chain tension by turning the tensioner screw un-
til the tie straps just touch the bottom side of
the bar rail.
6. Tighten the nuts se-
curely with the bar tip
held up (12 ~ 15 Nm).
Then check the chain
for
smooth
rotation
and
proper
tension
while moving it by hand. If necessary, readjust
with the chain cover loose.
3 HP
52 cc
20" (508 mm)
520 ml
25:1
320º C
11 000 r/min
6,5 kg (14,3 lb)
E N G L I S H •
7. Tighten the tensioner screw.
NOTE: a new chain will expand its length in the
beginning of use. Check and readjust the ten-
sion frequently as a loose chain can easily derail
or cause rapid wear of itself and the guide bar.
FUEL AND REFUELING
WARNING: Gasoline is very flammable.
Avoid smoking or bringing any flame or sparks
near fuel. Make sure to stop the engine and al-
low it to cool before refueling the unit.
Select outdoor bare ground for fueling and
move at least 3 m (10 ft) away from the fueling
point before starting the engine.
• Mix regular gasoline.
• Recommended mixing ratio.
Gasoline 25:Oil 1
- Exhaust emission are controlled by the
fundamental engine parameters and com-
ponent (eq., carburation, ignition timing
and port timing) without addition of any
major hardware or the introduction of an
inert material during combustion.
- These engines are certified to operate on un-
leaded gasoline.
- Make sure to use gasoline with a minimum
octane number of 89RON (USA/Canada: 87AL).
- If you use a gasoline of a lower octane value
than prescribed, there is a danger that the en-
gine temperature may rise and an engine prob-
lem such as piston seizing may consequently
occur.
- Unleaded gasoline is recommended to reduce
the contamination of the air for he sake of your
hearth and the environment.
- Poor quality gasoline or oils may damage seal-
ing rings, fuel lines or fuel tank of the engine.
HOW TO MIX FUEL
WARNING: Pay attention to agitation.
1. Measure out the quantities of gasoline and
oil to be mixed.
2. Put some of the gasoline into a clean, ap-
proved fuel container.
3. Pour in all of the oil and agitate well.
4. Pour in the rest of gasoline and agitate again
for at least one minute. As some oils may be dif-
ficult to agitate depending on oil ingredients,
sufficient agitation is necessary for the engine
to last long.
5. Put a clear indication on the outside of the
container to avoid mixing up with gasoline or
other containers.
Us er 's M an u a l
15
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