Stihl MS 661 C-M User Manual

126 MS 661, MS 661 C-M
14.7.1 Handle Heating and Generator Troubleshooting Chart
Check generator
Resistance between engine ground
and generator connection
about 0.5 – 1 Ω?
Start
Do both handles
warm up?
Measure resistance of individual
heating elements with ohmmeter
Separate the screw connection to the
thermostatic switch
b 13.4
no
yes
Set switch
to on
yes
Resistance
of rear handle heating element
about 1.6 Ω?
Check rear handle heating element.
In good condition?
Flat against handle housing?
Heater switch
on "F"?
no
no
no
Install new rear handle
heating element
b 14.5
Replace
generator
b 14.7
yes
yes
yes
no
2
1
3

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