Stihl MS 661 C-M User Manual

98 MS 661, MS 661 C-M
13.4 Carburetor
– Open the fuel tank cap and drain
the fuel tank, b 1.1.
– Collect the fuel in a clean
container, b 1.1
– Remove the filter base, b 13.3
– Remove the shroud, b 6.4
– Disconnect the throttle rod from
the trigger and carburetor,
b 11.3
Disconnect the fuel hose only when
the tank cap is open.
Models without M-Tronic
– Remove the choke rod, b 11.3.1
Versions with carburetor heating
: Pull the wire (1) out of the guides
(arrows), remove the heating
element (2) and put it to one side.
1166RA306 TG
1
2
: Take out the screw (1) and pull
the thermocouple's wire (2) out of
the guide (arrow).
Models with M-Tronic
: Take out the screw (1) and pull
the M-Tronic's red wire (2) out of
the guides (arrows).
: Disconnect spade terminal (1)
from the contact spring (2) and
pull the M-Tronic's black wire (2)
out of the guides (arrows).
2
1
1166RA307 TG1166RA308 TG
1
2
1166RA309 TG
31
2
All models
: Push out the grommet (1) and
then pull it out between the tank
housing and cover (2).
: Use the tab (arrow) to pull out the
elbow connector (1) with fuel
suction hose (2).
: Disconnect impulse hose (1).
1
1166RA310 TG
2
1
1166RA311 TG
2
1
1166RA312 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