Stihl MS 661 C-M User Manual

29MS 661, MS 661 C-M
: Remove the cylinder gasket (1).
: Inspect the manifold (1) and
replace it if necessary – even
very minor damage can result in
engine running problems, b 3.7
: Loosen the screw (2) and
remove the manifold (1).
A new manifold comes with the
washer already installed.
: Inspect the washer (1) in the
manifold (2), remove and replace
if necessary – a damaged
washer must be replaced.
– Clean the sealing faces, b 16
1166RA058 TG
1
1
1166RA059 TG
2
1
1166RA451 TG
2
All sealing faces must be in perfect
condition. Always replace
components with damaged sealing
faces.
Always use a new cylinder gasket
when re-installing the cylinder.
Installing
– Coat the inside of the manifold
with STIHL press fluid, b 16
: Insert new washer (1) through
larger diameter of manifold (2) as
shown.
: Position the washer (1) so that it
is properly seated (arrows).
1166RA452 TG
1
1
2
– Coat the inside of the manifold
flange with STIHL press fluid,
b 16
Washer must be installed in
manifold.
: Push the manifold (1) onto the
intake port so that the tab (2)
engages the web (arrow) – take
care not to displace or damage
the washer in the manifold.
: Fit the hose clamp (3) – the
screw (4) must be next to the
rib (5).
: Tighten down screw (4) until
distance 'a' is about 4 - 5 mm –
do not tighten as far as stop.
a
3
4
2
1
5
4
1166RA060 TG

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g