Adjusting The Carburetor; Standard Setting; Adjusting Idle Speed - Stihl 034 Series User Manual

Fit the choke shutter, round notch
first, with the small bore facing
the choke lever.
Note:
When choke shutter is closed, its
whole circumference must locate
against choke tube wall.
– Coat the fastening screw with
LOCTITE 270, see 13.2, and
tighten down firmly.
– Install the carburetor -
66
12.5

Adjusting the Carburetor

1 = Idle speed screw
2 = Low speed screw
3 = High speed screw
Note:
Carry out carburetor adjustments
only after warming up the engine
and cleaning the air filter.
The carburetor comes from the
factors with a standard setting.
This is the optimum setting of the
see 12.3 high speed screw under the
barometric pressure and climatic
conditions at the factory (300 m
above sea level).
It ensures the machine will deliver
maximum power, be fuel efficient
and operate reliably.

Standard setting

H = High speed screw opened
1 full turn.
L = Low speed screw opened
1 full turn.
– If the carburetor has to be
adjusted from scratch, first carry
out the standard setting.
If it is not possible to check the
maximum permissible engine speed
(13,000 rpm with bar and properly
tensioned chain), do not turn the
high speed screw beyond the
standard setting to make the
mixture leaner.
Caution:
The setting of the high speed
adjusting screw affects not only the
engine's performance but also its
maximum off-load speed. If the
setting is too lean (adjusting screw
turned too far clockwise), the
maximum permissible engine speed
will be exceeded and increase the
risk of engine damage due to a lack
of lubricant and overheating.
1
If the saw is used at high altitudes
(mountains) or near sea level it may
be necessary to correct the setting.
2
Carry out the correction with the two
adjusting screws:
3
– Turn clockwise (leaner) at high
– Turn counterclockwise (richer) at
Caution:
Even slight changes to the adjusting
screws have a noticeable effect on
engine running behavior.

Adjusting idle speed

Engine stops while idling:
– Turn idle speed screw clockwise
– Then back off the screw one
Chain runs while engine is idling:
– Turn idle speed screw counter-
– Then turn the screw about
altitudes.
sea level.
until the chain begins to move.
quarter turn.
clockwise until the chain stops
running.
another quarter turn in the same
direction.
034, 036, 036 QS