Instruction Manual

MS 461 R
English
33
N Switch off the engine
N Put on protective gloves
Versions with depth limiter (special
accessory)
N Loosen adjusting screw(1)
N Push the slide(2) toward the engine
as far as it will go
N continue with "For all versions"
For all versions
N The saw chain must lie against the
bottom of the bar – and it must be
possible to pull it across the guide
bar by hand when the chain brake is
released
N If necessary, retension saw chain
A new saw chain must be retensioned
more frequently than one that has been
in use already for an extended period.
N Check chain tension frequently –
see "Operating Instructions"
Versions with depth limiter
N Push the slide toward the tip of the
bar as far as it will go or set the
desired cutting depth
N Tighten the adjusting screw
This engine is certified to operate on
unleaded gasoline and the STIHL two-
stroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of high-
quality gasoline and two-stroke air
cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 ((R+M)/2)
and no more than 10% ethanol content.
NOTICE
Fuel with an octane rating below 89 may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or damage the
engine. For this reason STIHL
recommends that you use only quality
unleaded gasoline!
NOTICE
Gasoline with an ethanol content of
more than 10% can cause running
problems and major damage in engines
and should not be used.
For further details, see
www.STIHLusa.com/ethanol
The ethanol content in gasoline affects
engine speed – it may be necessary to
readjust the carburetor if you use fuels
with various ethanol contents.
Checking Chain Tension
1
3443BA033 KN
2
Fuel