Stihl MS 240

103MS 240, MS 260, MS 260 C
Does
thermostatic switch close
between + 13°C (55 °F) and + 6 °C
(43 °F), but no later than
+ 6 °C (43 °F)?
15.2 Carburetor Heating System Troubleshooting Chart
– Measure resistance of
heating element at
temperature = +20°C (68°F)
– Check thermostatic switch on basis of
tolerance range of + 13°C (55 °F) to + 6°C
(43 °F)
no
– Replace heating
element, b 15.1
Carburetor heating system
in order
yes
Resistance
G Generator
1 Handlebar
2 Rear handle
3 Heater switch
4 Heating element (carburetor)
5 Thermostatic switch
165RA453 TG
G
1 4
5
2
3
Circuit diagram
approx. 8 Ω?
– Replace thermostatic
switch, b 15.1.3
yes
– Replace thermostatic
switch, b 15.1.3
yes
Does
thermostatic switch open
between + 6°C (55 °F) and + 13 °C
(43 °F), but no later than
+ 13 °C (55 °F)?
no
no