Cleaning The Air Filter; Engine Management - Stihl MS 251 Notice D'emploi

Cleaning the Air Filter

If there is a noticeable loss of engine
power
Remove the shroud – see "Shroud"
N
Removing the air filter
Clean away loose dirt from around
N
the filter
NOTICE
Do not use tools to remove and install
the air filter – the air filter could be
damaged in the process.
1.
2.
Turn air filter 1/4 turn
N
counterclockwise and remove in the
direction of the rear handle
Always replace a damaged filter
N
Cleaning the air filter
Knock out the filter or blow it clear
N
with compressed air from the inside
outwards
If knocking-out or blowing-out does not
suffice, or in the case of stubborn dirt or
stuck filter fabric, the filter must be
subjected to a thorough cleaning.
MS 251, MS 251 C
Thorough filter cleaning
Wash the filter in STIHL special-
N
purpose cleaner (special
accessory) or a clean, non-
flammable cleaning liquid (e. g.,
warm soapy water) – rinse the filter
from inside to out under a water jet
– do not use high-pressure cleaners
Dry all filter parts – do not expose to
N
extreme heat
Do not oil the filter
N
Reinstall filter
N
Installing the air filter
1.
2.
Fit air filter
N
Press the air filter in the direction of
N
the filter housing and
simultaneously turn it clockwise
until the air filter engages – the
"STIHL" logo must be horizontal
Fit the shroud – see "Shroud"
N

Engine Management

Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
English
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