Stihl MS 390 User Manual

55MS 290, MS 310, MS 390
: Push the manifold (1) into the
handle housing.
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: Pry the plug (1) out of the annular
buffer.
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: Ease the annular buffer out of the
handle housing.
– Remove the handle housing.
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If the handle housing is being
replaced because of damage, carry
out the following additional
operations:
– Remove the switch shaft, b 9.4
– Remove the contact spring,
b 7.4
– Remove the throttle trigger/
interlock lever, b 9.5
– Replace damaged annular
buffers, b 9.3
Install in the reverse sequence.
– To fit the manifold in the handle
housing intake opening, wind a
piece of string (about 15 cm long)
around the back of the manifold
flange.
: Place the handle housing in
position and pass the string (1)
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through the housing opening.
: Pull the fuel hose (2) through the
housing opening.
: Pass the short circuit and ground
wires and grommet (1) through
the housing opening.
: Fit the grommet (1).
: Pull the impulse hose (2) into the
housing opening.
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2
Pull the impulse hose into position
so that its flat rear side locates
against the engine housing.
Check that impulse hose and
suction hose have no kinks.
Make sure the short circuit and
ground wires are positioned
correctly.
: Pull the ends of the string
outward and remove the string
from the manifold (1).
Install all other parts in the reverse
sequence.
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Stihl MS 390 Specifications

General

Engine Displacement	64.1 cc
Chain Pitch	3/8"
Weight	6.2 kg
Guide Bar Lengths	40 to 50 cm
Fuel Capacity	0.68 l (23.0 oz)