Instruction Manual

MS 231, MS 231 C, MS 251, MS 251 C
English
35
N Wash the filter in STIHL special
cleaner (special accessory) or a
clean, non-flammable solution (e.g.
warm soapy water). Rinse the filter
from the inside outwards under a jet
of water – do not use a pressure
washer.
N Dry the filter components – do not
expose to high temperatures.
NOTICE
High temperatures and oil can damage
the air filter. Filter efficiency can
deteriorate as a result.
– Allow air filter to dry without using
any external source of heat.
– Do not impregnate the filter with oil.
N Install the air filter.
Cleaning the air filter (HD2 filter)
N Knock out the filter.
N Spray outside of filter with STIHL
special cleaner or soapy water.
N Rinse outside of filter under warm
running water.
NOTICE
High temperatures and oil can damage
the air filter. Filter efficiency can
deteriorate as a result.
– Allow air filter to dry without using
any external source of heat.
– Do not impregnate the filter with oil.
N Allow air filter to dry.
N Install the air filter.
Installing the air filter
N Place the air filter in position.
N Push the air filter in the direction of
the filter housing and turn it
clockwise at the same time until it
engages – the "STIHL" name must
be horizontal.
N Install the shroud – see "Shroud".
Basic information
The carburetor comes from the factory
with a standard setting.
The carburetor has been adjusted for
optimum performance and fuel
efficiency in all operating states.
Standard setting
N Switch off the engine
N Check the air filter – clean or replace
it if necessary
N Turn the high speed adjusting
screw (H) counterclockwise as far
as possible (max. 3/4 turn)
N Turn the low speed adjusting
screw (L) clockwise until it is firmly
in its seat – then back off 1/4 turn
Setting the idle speed
N Make standard setting
N Start engine and let it warm up
2710BA001 KN
2.
1.
Adjusting the Carburetor
2310BA027 KN