Stihl MS 661 C-M

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