Ignition System - Stihl MS 290 Manual

: Heat ball bearing to approx. 50°C
and, with closed side facing
outwards, push it on to the
crankshaft stub as far as stop.
When the crankshaft is removed, it
is recommended that the "hard" oil
seals 9639 003 1743 be installed in
place of the "soft" oil seals
9639 010 1743.
Note
The "hard" oil seals may be
installed on the crankshaft only
when it is removed from the engine.
The "soft" oil seals must be used if
the crankshaft is in the installed
condition.
– Lubricate sealing lips of oil seals
with grease, b 13.
36
: Slide oil seals over the crankshaft
stubs so that their open sides are
facing the ball bearings (arrow).
Install all other parts in the reverse
sequence.
7.

Ignition System

Exercise extreme caution when
troubleshooting and carrying out
maintenance or repair work on the
ignition system. The high voltages
which occur can cause serious or
even fatal accidents!
Troubleshooting on the ignition
system should always begin at the
spark plug, b 4.4
2 1
The electronic (breakerless) ignition
system basically consists of an
ignition module (1) and flywheel (2).
MS 290, MS 310, MS 390