Stihl MS 361, Instruction Manual

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

143BA007 KN

► 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.

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‐

line

STIHL two-stroke

engine oil 1:50

Liters

Liters

(ml)

1

0.02

(20)

5

0.10

(100)

10

0.20

(200)

15

0.30

(300)

20

0.40

(400)

25

0.50

(500)

► Pour oil into an approved safety fuel canister

first, then add gasoline and mix thoroughly

8 Checking Chain Tension

English

0458-212-0121-C

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