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English / USA
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 and low speed
screws within fine limits.
22
Standard Setting
:
Shut off the engine.
:
Inspect cutting blades and clean if
necessary (they must be clean,
move freely and not be warped).
:
Check that throttle cable is properly
adjusted – readjust if necessary –
see chapter on "Adjusting the
Throttle Cable".
:
Check spark arresting screen (not
fitted in all markets) and clean or
replace as necessary.
:
Check the air filter and clean or
replace as necessary.
:
Carefully turn both adjusting screws
counterclockwise as far as the stop:
The high speed screw (H) and low
speed screw (L) are now 3/4 turn
open.
:
Start and warm up the engine.
:
Adjust idle speed with the idle speed
screw (LA) so that the cutting
blades do not run.
Fine Tuning
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 or at sea level.
Rule of Thumb
:
Turn the high speed screw (H)
about one quarter turn for every
1000m (3300 ft) change in altitude.
:
Carry out the standard setting
without disturbing the high speed
screw (H) .
:
Warm up the engine for about 3
minutes.
:
Open the throttle wide.
HL 90 K
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