Remove Air Filter; Cleaning The Air Filter; M-Tronic - Stihl MS 661 C-M Instruction Manual

Remove air filter

Turn the knob above the rear handle
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in the direction of the arrow and
remove the carburetor box cover
Remover filter
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MS 661 C-M

Cleaning the Air Filter

If there is a noticeable loss of engine
power:
Knock out the filter or blow it clear
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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.
Always replace a damaged filter.
Thorough filter cleaning
Wash the filter in STIHL special-
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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
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extreme heat
Do not oil the filter
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Reinstall filter
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M-Tronic

Basic information
M-Tronic regulates the fuel quantity and
ignition timing for all operating states
electronically.
M - Tronic stands for easy, fast starting,
constant optimum engine performance,
outstanding acceleration and automatic
adaptation to changes in operating
conditions.
Manual carburetor adjustments are no
longer required – the carburetor does
not have any adjusting screws.
Automatic adjustment
Under extremely changed operating
conditions, attainment of the optimal
setting can be accelerated as follows:
Carry out five uniform cuts to length
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under full load
English
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