Adjusting The Carburetor - Stihl FS 85 Instruction Manual

English
4
► Place the felt element (4) (lettering facing
inwards) in the filter housing (5).
► Fit the filter cover.
► Tighten down the screw in the filter cover
firmly.

19 Adjusting the Carburetor

The carburetor comes from the factory with a
standard setting.
This setting provides an optimum fuel-air mixture
under most operating conditions.
With this carburetor it is only possible to adjust
the high speed screw within fine limits.
19.1 Standard Setting
► Shut off the engine.
► Mount FS cutting attachment, power tool
attachment or KombiTool.
► Check the air filter and clean or replace as
necessary.
► Check that the throttle cable is properly adjus‐
ted – readjust if necessary – see chapter on
"Adjusting the Throttle Cable".
82
5
► Turn high speed screw (H) counterclockwise
as far as stop (no more than 3/4 turn).
► Turn the low speed screw (L) carefully clock‐
wise as far as stop, then turn it back 1 turn
► Start and warm up the engine.
► Adjust idle speed with the idle speed
screw (LA) so that the cutting attachment does
not run.
19.2
A slight correction of the setting of the high
speed screw (H) may be necessary if engine
power is not satisfactory when operating at high
altitude, sea level or after changing the cutting
attachment.
Rule of thumb:
Turn the high speed screw (H) about one quarter
turn for every 1000 m (3300 ft) change in alti‐
tude.
Conditions for adjustment
19 Adjusting the Carburetor
H
3 / 4
Fine Tuning
L
1
LA
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