Replacing The Tank Housing; Carburetor Heating; Testing - Stihl MS 341 Shop Manual

12.10 Replacing the Tank
Housing
– Separate the crankcase and tank
housing – b 12.9
– Remove the front handle –
b 10.3
– On machines with handle heating
and/or carburetor heating,
remove the stop switch – b 14.6
– Remove the throttle trigger –
b 10.2
– On machines with
QuickStop Super, remove the
brake cable – b 5.5.2
– Remove the contact spring –
b 7.2
2
: Pull tank cap cord (1) out of
slot (2).
– Remove the tank cap.
– Remove the fuel hose – b 12.8
– Remove the tank vent – b 12.6
– Remove the spring and annular
buffer between the crankcase
and tank housing – b 9.1.3
Reassemble in the reverse
sequence.
Make sure the impulse hose and
wires are correctly positioned
without kinks.
– Carry out leakage test – b 12.6
88
13.

Carburetor Heating

Current is supplied via wires to the
heating element installed between
the heating plate and carburetor.
Carburetor heating is controlled by
a thermostatic switch on the heating
plate.
The carburetor heating system
should be checked if running
problems occur when the cold
engine is idling or running at part
load, particularly at temperatures
below freezing.
Idling problems with a hot engine
are also an indication of a fault in the
carburetor heating system.
1
13.1

Testing

Complete system
The generator and heating element
are checked in the following test
which should be performed at an
ambient temperature of at least
+ 20 °C (68 °F).
If the temperature is lower than
+ 13 °C (55 °F), the thermostatic
switch may close and produce false
readings.
Test the thermostatic switch
separately.
– Remove the filter base – b 12.1
– Set the ohmmeter to measuring
range "W".
: Clip one of the two test leads to
the carburetor body and the other
to a cylinder fin (ground).
– If the system is in good condition
the ohmmeter will indicate about
8 W in measuring range "W".
To ensure good electrical contact,
press the heating plate and the
heating element against the
carburetor during the
measurement.
If the reading obtained is outside
this tolerance, test each component
separately.
MS 341, MS 361, MS 361 C