Stihl MS 390 User Manual

32 MS 290, MS 310, MS 390
: Compress the piston rings with
clamping strap (1)
1127 893 2602.
: Push the piston carefully into the
cylinder.
: Remove the clamping strap (1).
209RA101
VA
1
: Position the crankshaft so that
the long crankshaft stub (1)
points to the right, looking at
exhaust port (2).
209RA102
VA
1
2
– Push the crankshaft home until
the ball bearings are seated.
Make sure that ball bearings and oil
seals are correctly seated.
: Apply a thin bead of sealant to
the groove in the engine pan
mating face, b 13.
Follow manufacturer’s instructions.
– If necessary, install the engine
pan, b 6.5
209RA104
VA
: Push the manifold on to the
intake port so that the straight
faces (arrows) are in alignment.
209RA105
VA
: Fit clamp (1) with its ends facing
up at an angle of 30° to the left.
: Tighten down the clamp (1) until
its ends butt against the sleeve
(2) or the gap “a” is 6 to 7 mm.
If a new cylinder is installed, also
209RA106
1
VA
a
2
30˚
install a new piston, b 6.5.2

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)