23
HL 75, HL 75 K
English / USA
Standard Setting
:
Shut off the engine.
:
Inspect the cutting blades and clean
if necessary (they must be clean,
move freely and not be warped).
:
Check the air filter and install a new
one if necessary.
:
Check spark arresting screen* and
clean or replace as necessary.
:
Turn high speed screw (
H
)
counterclockwise (
max.
3
/
4
turn
) as
far as stop.
:
Carefully screw the low speed
screw (
L
) clockwise down onto its
seat. Then open it
one
full turn
counterclockwise.
:
Start and warm up the engine.
:
Adjust idle speed with the idle speed
screw (
LA
) so that the cutting
blades do not run.
*
see "Guide to Using this Manual"
Adjusting Idle Speed
Engine stops while idling
:
Turn idle speed screw (
LA
) slowly
clockwise until the engine runs
smoothly – the cutting blades must
not run.
Cutting blades run when engine is
idling
:
Turn idle speed screw
(LA)
slowly
counterclockwise until cutting
blades stop running and then turn
the screw about another
1
/
2
to 1
turn
in the same direction.
Erratic idling behavior, poor
acceleration
Idle setting
too lean
:
:
Turn low speed screw (
L
)
counterclockwise (about
1
/
4
turn
)
until the engine runs and
accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (
LA
)
after every correction to the low speed
screw (
L
).
Fine Tuning for Operation at
High Altitude
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:
:
Check standard setting.
:
Allow the engine to warm up.
:
Turn high speed screw (
H
) and low
speed screw (
L
) clockwise (leaner).
To avoid the risk of engine damage,
do not make the mixture too lean as
this will otherwise cause the engine
to over-rev.
It is usually necessary to change the
setting of the idle speed screw (
LA
)
after every correction to the low speed
screw (
L
).
LA
H
L
1
3 / 4
389BA051 KN
LA
H
L
1
3 / 4
389BA052 KN
LA
H
L
1
3 / 4
389BA051 KN