Stihl MS 661 C-M User Manual

124 MS 661, MS 661 C-M
: Push connecting wire (1) to the
handlebar between the rib and
handle heating element (arrow)
first, and then the connecting
wire (2) to the generator.
– Reassemble all other parts in the
reverse sequence.
14.6 Heating Element in
Handlebar
The heating element in the
handlebar (front handle) is not
replaceable. A new handlebar must
be fitted if the heating element is
faulty.
Testing the heating element
– Remove the handle molding,
b 11.2
Use the following test procedure to
test the function of the handlebar
heating element.
– Separate the connectors of the
heating element on the rear
handle.
Carry out measurement between
the two connector pins and the
heater switch contact sleeve.
– Set the heater switch to F.
1166RA387 TG
1
2
: Clip one test lead to the
connecting wire's connector
pin (1) and the second to the
heater switch contact sleeve.
If the heating elements are in good
condition the ohmmeter will indicate
a value of about 6.4 Ω(measured
value 6.0 – 8.0 Ω) in measuring
range "Ω".
If the reading is outside this range,
test the handlebar (handlebar
heating element) directly on the
connecting wires.
– Separate pin and socket
connector on handlebar,
b 10.5.1
: Clip one test lead to the
connector pin of wire (1) and the
other test lead to the heater
switch contact sleeve.
If the heating elements are in good
condition the ohmmeter will indicate
a value of about 6.4 Ω (measured
value 6.0 – 8.0 Ω) in measuring
range "Ω".
100
50
30
20
10
5
0
20
10
5
2
1166RA388 TG
1
100
50
30
20
10
5
0
20
0
1
1166RA389 TG
If the reading is outside this range,
install a new handlebar with heating
element, b 10.5.1
Heating element does not operate
even though resistance
measurement is ok?
– Test connecting wire to rear
handle heating element, replace
if necessary, b 14.8
– Test connecting wire to
generator, replace if necessary,
b 14.3, b 14.8
– Test the generator and heater
switch, replace if necessary,
b 14.7, b 14.4
– Reassemble in the reverse
sequence.
14.7 Generator
– Remove the control unit, b 7.2
– Remove the flywheel, b 7.7
: Pull the insulating tube (1) with
connector and generator wire out
of the guides (arrows).
: Push back the insulating tube (1)
in the direction of generator (2)
and separate the pin and socket
connector.
1166RA132 TG
1
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