Stihl MS 650

71MS 650, MS 660
Always check the suction hose and
pickup body before disassembling
the oil pump.
– Remove the oil pump – b 11.3.1
: Use a 2 mm drift to drive out the
spring pin (1).
178RA118
VA
677
3
2
4
1
5
: Pull out the control bolt (2).
: Remove the O-rings (3).
: Pry out the plug (4).
: Remove the pump piston (5) with
spring (6) and washers (7).
– Clean all parts and examine for
serviceability – b 17
Always install new O-rings.
– Lubricate the pump piston and
worm with grease before
installing – b 17
: When fitting the control bolt (2),
press in the plug (4) against
spring pressure.
Reassemble in the reverse
sequence.
Dirty air filters reduce engine power,
increase fuel consumption and
make starting more difficult.
The air filter should be cleaned
when there is a noticeable loss of
engine power.
: Unscrew the twist lock (1).
: Remove the filter cover (2).
1
2
178RA008
VA
: Pull off the air baffle (1) vertically.
178RA009
VA
1
: Remove the air filter (1).
– Remove and clean the felt
prefilter (machines with HD air
filter).
– Knock out the filter or blow it clear
with compressed air from the
1
VA
178RA119
inside outwards.
– In case of stubborn dirt, wash all
parts of the filter in STIHL
universal cleaner or a fresh, non-
flammable cleaning solution (e.g.
warm soapy water) and allow to
dry.
– Do not use a brush to clean the
felt prefilter. Replace damaged
filters.
: Pull off the baffle (1) in the
direction of the arrow.
178RA120
VA
1
11.3.2 Servicing 12. Fuel System
12.1 Air Filter