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8 Checking Chain Tension
Retensioning during cutting work:
► Shut off the engine.
► Loosen the nuts.
► Hold the bar nose up.
► Use a screwdriver to turn the tensioning
screw (1) clockwise until the chain fits snugly
against the underside of the bar.
► While still holding the bar nose up, tighten
down the nuts firmly.
► Go to "Checking Chain Tension".
A new chain has to be retensioned more often
than one that has been in use for some time.
► Check chain tension frequently – see chapter
on "Operating Instructions".
8
Checking Chain Tension
► Shut off the engine.
► Wear work gloves to protect your hands.
► The chain must fit snugly against the under‐
side of the bar and it must still be possible to
pull the chain along the bar by hand.
► If necessary, retension the chain.
A new chain has to be retensioned more often
than one that has been in use for some time.
► Check chain tension frequently – see chapter
on "Operating Instructions".
9
Fuel
The engine requires a mixture of gasoline and
engine oil.
WARNING
Avoid direct skin contact with fuel and breathing
in of gasoline fumes.
9.1
STIHL MotoMix
STIHL recommends using STIHL MotoMix. This
pre-blended fuel is free of benzene and lead, is
distinguished by a high octane rating, and
always provides the proper mixing ratio.
0458-567-0121-B
STIHL MotoMix uses STIHL HP Ultra two-stroke
engine oil for optimum engine life.
MotoMix is not available in all markets.
9.2
Mixing fuel
NOTICE
Unsuitable fuels or a mixing ratio that deviates
from the specification can lead to severe engine
damage. The engine, seals, fuel lines and fuel
tank may be damaged if low-quality gasoline or
engine oil is used.
9.2.1
Gasoline
Use only high-quality gasoline with an octane rat‐
ing of at least 90 ROC – leaded or unleaded.
Gasoline with an alcohol component exceeding
10% can cause impaired engine performance in
engines with manually adjustable carburetors
and thus should not be used in these engines.
Engines with M-Tronic deliver full engine per‐
formance using gasoline with an alcohol compo‐
nent of up to 27% (E27).
9.2.2
Engine oil
If you mix the fuel yourself, use only STIHL two-
stroke engine oil or another high-performance
engine oil classified as JASO FB, JASO FC,
JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-
EGD.
STIHL specifies STIHL HP Ultra two-stroke
engine oil or an equivalent high-performance
engine oil in order to maintain emission limits
over the machine's service life.
9.2.3
Mixing ratio
with STIHL two-stroke engine oil 1:50; 1:50 =
1 part oil + 50 parts gasoline
9.2.4
Examples
Quantity of gaso‐
STIHL two-stroke
line
engine oil 1:50
Liters
Liters
1
0.02
5
0.10
10
0.20
15
0.30
20
0.40
25
0.50
► Pour oil into an approved safety fuel canister
first, then add gasoline and mix thoroughly
English
(ml)
(20)
(100)
(200)
(300)
(400)
(500)
17
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