Stihl MS 661 C-M User Manual

31MS 661, MS 661 C-M
– Coat the outside of the manifold
flange with STIHL press fluid,
b 16
: Hold the tank housing steady and
pull the ends of the string (2) with
manifold flange (1) through the
opening – take care not to
displace or damage the washer in
the manifold.
– Remove the string.
: Position the manifold flange (1) –
its recesses (arrows) must locate
against the studs (2).
: Fit the washer (3) and push the
sleeve (4) into the manifold
flange (1).
– Reassemble all other parts in the
reverse sequence.
1166RA067 TG
2
1
1166RA068 TG
1
2
2 43
6.6 Crankshaft
– Drain the fuel and oil tanks,
b 1.1
– Remove the brake band, b 5.2
– Remove the brake lever, b 5.3
– Remove the handlebar, b 10.5
Version with heating, b 10.5.1
– Remove the flywheel, b 7.7
– Machines with handle heating
Remove the generator, b 14.7
– Remove wiring harness at
ignition side, b 7.9,
models with M-Tronic / heating,
b 7.10
– Remove the cylinder, b 6.5
– Remove the piston, b 6.7
– Remove the tank housing,
b 13.11.4
Always install new bearings and oil
seals after removing the crankshaft,
b 6.6.1 and b 6.3.
Clutch side of crankcase
The oil pump must be left in position
when the crankshaft is removed. It
serves as a stop for the ball bearing.
: Remove the retaining ring (1).
1
1166RA048 TG
: Take out the screws (1) and
remove the flange (2).
: Take out the screws (arrows).
: The tensioner slide (1) must butt
against the thrust pad (arrow).
Use the tools in the service tool set
5910 007 2222 to remove and
install the clutch side of the
crankcase
1166RA070 TG
1
2
1
1166RA071 TG
1166RA072 TG
1

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