Stihl MS 650

83MS 650, MS 660
: Screw puller 5910 890 4500
about 5 turns counterclockwise
into the limiter cap.
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: Line up the limiter cap on the high
speed screw (H) so that its slot is
in line with the slot in the
carburetor body – limiter cap’s
lug must be visible through the
slot in the carburetor body.
: Marks on limiter cap and
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1 2
H
segment are in alignment
(arrow).
Note:
The lug is in line with the slot.
On older machines, the limiter cap’s
lug is at 90° to the slot. Align the lug
relative to the slot by eye.
– Pull off the limiter cap.
Note:
Limiter caps that have been
removed once are damaged and
must not be re-used.
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After removing the limiter caps it is
necessary to carry out the basic
setting first.
– Screw down both adjusting
screws until they are against their
seats.
– Open the high speed screw (H)
(1) one full turn.
– Open the low speed screw (L) (2)
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2
1
one full turn.
The basic setting of the carburetor
is easier with the setting disk
5910 893 6600 fitted on the
screwdriver.
Adjusting idle speed (with
tachometer)
– Check the air filter and clean or
replace as necessary.
– Check the spark arresting screen
and clean or replace as
necessary.
– Check chain tension.
– Warm up the engine.