Carburetor Heating System Troubleshooting Chart - Stihl MS 661 Manual

14.2

Carburetor Heating System Troubleshooting Chart

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