Stihl FC 90 - Manufacturers Warranty Coverage; Owners Warranty Responsibilities

36 Series 4180 Powerhead
– Remove cam gear cover, b 7.2
: Check free movement and
function of decompression
system lever (arrow).
– Lever must project about 2 mm
from cam.
VA
249RA140
– Push decompression system
lever counterclockwise. The lever
must move freely and retract fully.
If the lever is difficult to move, worn
or not visible, install a new cam
gear.
– Remove the rewind starter,
b 5.2
– Remove the shroud, b 5.7
: Take out the screws (arrows).
: Remove the cover (1).
VA
249RA050
1
: Take out the screw, if fitted, lift up
the spark arresting screen (1)
and pull it out.
– Clean the spark arresting screen
or replace if necessary.
VA
249RA051
1
: To remove the muffler, take out
the screws (arrows).
: Remove the exhaust gasket (1).
Reassemble in the reverse
sequence.
– Use a new exhaust gasket.
– Tighten down the muffler screws
VA
249RA052
1
firmly, b 3.4
– Tighten down the cover screws,
b 3.4
7.4.1 Decompression System 7.5 Muffler / Spark Arresting
Screen