Stihl MS 661 C-M User Manual

21MS 661, MS 661 C-M
– Lubricate the brake lever, cam
lever and hand guard slot with
STIHL grease, b 16
: Turn cam lever (1) to one side
until the cam of the hand guard
(arrow) slips past it, then push the
hand guard (2) and brake
lever (3) onto the pivot pins (4, 5).
: Fit the E-clip (6).
The turns of the brake spring must
be tightly against one another in the
relaxed condition. If this is not the
case, replace the brake spring.
– Center the protective tube on the
brake spring.
: Hook the brake spring (1) to the
brake lever (2) and use the
assembly tool (3) 1117 890 0900
to attach it to the anchor pin.
– Reassemble all other parts in the
reverse sequence.
2
4
1
3
5
6
1166RA016 TG
1
3 2
1166RA017 TG
5.4 Cam Lever
The cam lever defines the locked
position of the hand guard.
– Remove the brake lever, b 5.3
: Disconnect the spring (1) from
the anchor pin (2) and cam
lever (4).
: Remove the E-clip (3) and pull off
the cam lever (4).
– Check the cam lever, spring and
cam running face on the hand
guard, and replace as necessary.
– Inspect all pivot pins and replace
if necessary,
b 5.5
Installing
– Lubricate the pivot pins with
STIHL grease, b 16
– Install the cam lever so that the
lobe points in the direction of the
carburetor.
– Fit the E-clip-
1166RA018 TG
1
43
2
: Attach the spring (1) to the cam
lever so that the open side of the
spring hook (arrow) faces
outwards.
: Attach the spring (1) to the
anchor pin (2).
The cam lever is not yet under
tension – the spring may become
detached.
– Lubricate the cam lever with
STIHL grease, b 16
– Reassemble all other parts in the
reverse sequence.
5.5 Pins
The anchor and pivot pins secure
the springs. Worn pins must be
replaced.
– The springs may otherwise
become detached and pop out.
The pins must be driven home
squarely.
– Remove the brake lever, b 5.3
– Remove the cam lever, b 5.4
1
1166RA019 TG
2

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