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2
3
1
4
002BA423 KN
b
a
► Place the cutting attachment (1) in position.
WARNING
Collar (a) must locate in the cutting attachment's
mounting hole (b).
Securing the cutting attachment
► Fit the thrust washer (2) – convex side must
face up.
► Fit the rider plate (3).
A rider plate (3) for sawing applications is availa‐
ble as a special accessory. It allows the full
depth of cut of the saw blade to be used.
► Block the shaft.
► Fit the nut (4) counterclockwise and tighten it
down firmly.
WARNING
If the mounting nut has become too loose, fit a
new one.
NOTICE
Remove the tool used to block the shaft.
7.13.1
Removing the cutting attachment
► Block the shaft.
► Unscrew the mounting nut clockwise.
► Pull the cutting attachment with its mounting
hardware off the gearbox.
8
Fuel
Your engine requires a mixture of gasoline and
engine oil.
WARNING
For health reasons, avoid direct skin contact with
gasoline and avoid inhaling gasoline vapor.
8.1
STIHL MotoMix
STIHL recommends the use of STIHL MotoMix.
This ready-to-use fuel mix contains no benzol or
lead, has a high octane rating and ensures that
you always use the right mix ratio.
STIHL MotoMix uses STIHL HP Ultra two-stroke
engine oil for an extra long engine life.
MotoMix is not available in all markets.
8.2
Mixing Fuel
NOTICE
Unsuitable fuels or lubricants or mix ratios other
than those specified may result in serious dam‐
age to the engine. Poor quality gasoline or
engine oil may damage the engine, sealing rings,
hoses and the fuel tank.
8.2.1
Gasoline
Use only high-quality brand-name gasoline with
a minimum octane rating of 90 – leaded or unlea‐
ded.
Gasoline with an ethanol content of more than
10% can cause running problems in engines with
a manually adjustable carburetor and should not
be used in such engines.
Engines equipped with M-Tronic deliver full
power when run on gasoline with an ethanol con‐
tent of up to 25% (E25).
8.2.2
Engine Oil
If you mix the fuel yourself, use only STIHL two-
stroke engine oil or another high-performance
engine oil in accordance with 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.
8 Fuel
English
0458-433-0121-B
21
Summary of Contents for FS 311
Page 1: ...STIHL FS 311 Instruction Manual 2 36...
Page 37: ...27 EC Declaration of Conformity English 0458 433 0121 B 37...
Page 38: ...English 27 EC Declaration of Conformity 38 0458 433 0121 B...
Page 39: ...27 EC Declaration of Conformity English 0458 433 0121 B 39...
Page 40: ...www stihl com 04584330121B 04584330121B 0458 433 0121 B 0458 433 0121 B...