Stihl FS 25-4, User Manual

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- Remove rocker arm/pushrods
- see 6.4.
- Remove the crankshaft - see 6.9.
•
Press valve spring retainer (1)
down and move it sideways so
that the valve stem is in the large
hole.
•
Let go of valve spring retainer
and remove it together with the
valve spring (2).
- Take valves out of cylinder.
•
Inspect seats on exhaust valve
(1), inlet valve (2) and cylinder
and replace parts as necessary.
•
Check free length of valve
springs (3), replace springs if ne-
cessary.
Assemble in the reverse
sequence.
Important: Do not mix up inlet
and exhaust valves.
- Valve spring retainer must
engage properly in groove on
valve stem.
- Remove the valves - see 6.10.
- Remove the cam gear
- see 6.6.
- Remove the muffler - see 6.3.
- Remove the carburetor -
see 11.2.2.
•
Take out the screws (1).
•
Remove the heat shield (2) and
spacer flange (3).
•
Take screws out of spacer flange.
6.10 Valves/Valve Springs 6.11 Crankcase with
Cylinder
18 FS 25-4, 65-4