Stihl HT 131 User Manual

22 Series 4180 Powerhead
: Remove the flange.
VA
249RA110
: Examine the metering diaphragm
and sealing ring. Replace if
necessary, b 6.2.4
Reassemble in the reverse
sequence.
VA
249RA111
– Remove the flange, b 6.2.3
: Remove metering diaphragm (1)
and gasket (2) from the
carburetor body.
If the gasket and diaphragm are
stuck together, separate them
VA
249RA112
1
2
carefully.
: Check the diaphragm and gasket
and replace if necessary.
The diaphragm is the most delicate
part of the carburetor. The
diaphragm material is subjected to
continuous alternating stresses and
eventually shows signs of fatigue,
i.e. the diaphragm distorts and
swells and has to be replaced.
Reassemble in the reverse
sequence.
: Place the gasket (1) on the
carburetor body.
The cutout in the gasket (2) must
line up with the compensating bore
in the carburetor.
VA
249RA113
1
2
: Place the metering diaphragm (1)
on the gasket.
The cutout in the metering
diaphragm (2) must line up with the
compensating bore in the
carburetor and the gasket.
VA
249RA114
1
2
Assemble all other parts, b 6.2.3.
6.2.4 Metering Diaphragm

Stihl HT 131 Specifications

General

Engine Power	1.4 kW (1.9 bhp)
Displacement	36.3 cc
Sound Power Level	106 dB(A)
Overall Length	270 - 390 cm
Guide Bar Length	30 cm
Power Source	Gas
Chain Pitch	3/8"
Chain Gauge	1.3 mm