Information Before You Start - Stihl MS 390 Instruction Manual

English / USA
: Use a screwdriver to remove the
shutter (3) from the shroud.
: Turn the shutter 180° and refit it on
the left of the spark plug
(see illustration).
: Refit the spark plug boot.
34
1
1
: Install the prefilter (1) so that the
symbol r (winter operation) points
up.
: Refit carburetor box cover and
secure it with the twist lock.
Heated air is now drawn in from around
the cylinder and mixed with cold air –
this helps prevent carburetor icing.
At temperatures above +20 °C
(70°F)
: Return shutter and prefilter to
position s (summer operation).
This is essential to avoid engine
running problems, i.e. overheating!
Information
Before You Start
STOP
0
The four positions of the
Master Control lever
0
= Engine off –
ignition is switched off.
# = Normal run position –
engine runs or can fire.
To move the Master Control lever from #
n l
to or , press down the throttle
trigger interlock and squeeze throttle
trigger at the same time.
n
=Warm start – this position is used to
start a warm engine. The Master
Control lever moves to the normal
run position as soon as the throttle
trigger is squeezed.
l
=Cold start – this position is used to
start a cold engine.
MS 290, MS 310, MS 390