Stihl MS 661 C-M User Manual

108 MS 661, MS 661 C-M
Low speed screw
: Screw the puller (1)
5910 890 4500 about 5 turns
counterclockwise into the limiter
cap
– left-hand thread.
Do not turn the puller (1) any further
– the low speed screw (L) may
otherwise be damaged.
: Use the puller to turn the limiter
cap clockwise until the lug (2) or
screw slot is in line with slot (1).
The dot on the limiter cap must line
up with the mark (arrow).
– Pull out the limiter cap.
– Remove the low speed
screw (L).
1
1166RA283 TG
1166RA284 TG
2
1
L
H
: Inspect the tip (arrow) and
O-ring (1) for damage or wear
and replace the low speed
screw (L) if necessary.
– Screw down the low speed screw
(L) as far as stop.
– Continue with the high speed
screw (H).
High speed screw
: Screw the puller (1)
5910 890 4500 about 5 turns
counterclockwise into the limiter
cap
– left-hand thread.
Do not turn the puller (1) any further
– the high speed screw (H) may
otherwise be damaged.
3443RA320 TG
1
1
1166RA285 TG
: Check position of limiter cap. If
necessary, use the puller to turn
the limiter cap counterclockwise
until the lug (2) or screw slot is in
line with slot (1).
The dot on the limiter cap must line
up with the mark (arrow).
– Pull out the limiter cap.
– Take out the high speed screw
(H).
: Inspect the tip (arrow) and
O-ring (1) for damage or wear
and replace the high speed
screw (H) if necessary.
: Screw down the high speed
screw (H) as far as stop.
– Continue with "Pre-installing
limiter cap".
1166RA286 TG
2
1
L
H
3443RA324 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