Stihl MS 661 C-M User Manual

128 MS 661, MS 661 C-M
14.7.2 Test Connections and Test Values
– The pin and socket connections
of the wires in the rear handle
must be disconnected to test the
individual components.
1)
Pull out wire for this purpose
Component Ohmmeter
connection (use either
test lead)
Resistance Ω If faulty
Lead 1 Lead 2 Spec. Actual Cause Remedy
Switch Switch
terminal
1)
Switch
housing
< 0.5 - Switch faulty Replace switch
Heating element in
rear handle
Connector
on wire
from
heating
element
Connector
on wire
from
heating
element
1.6 1.5 - 2.0 Heating element
OK
- Break in wire,
heating element
damaged
Replace heating
element or
repair insulation
0 Short circuit –
damaged insulation
Heating element in
handlebar
Connector
on wire
from
handlebar
heating
element
Connector
on wire
from
handlebar
heating
element
6.4 6.0...8.0 Heating element
OK
- Break in wire,
heating element
damaged
Install new
handlebar
0 Short circuit –
damaged insulation
Repair insulation

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