Stihl MS 661 C-M User Manual

120 MS 661, MS 661 C-M
14.2 Carburetor Heating System Troubleshooting Chart
Measure resistance of heating
element at
temperature = +20°C (68°F)
Replace thermostatic
switch, b 14.1.3
no
Replace heating
element, b 14.1.2
Carburetor heating element
in order
yes
G = Generator
1 = Rear handle
2 = Handlebar
3 = Heater switch
4 = Thermostatic switch
5 = Heating element (carburetor)
0001RA505 TG
G
1 4
5
2
3
Resistance
approx. 8 Ω?
Circuit Diagram

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