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English / USA
Rule of thumb
Rotate the high speed screw (H) about
/4 turn for every 1000 meter (3300 ft)
change in altitude.
At high altitudes
:
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Conditions for adjustment
Carry out adjustment with nylon line
cutting head, making sure the
cutting lines are at full length (as far
as limiter blade on deflector).
Carry out standard setting without
altering position of the high speed
screw (H).
:
Warm up engine for about
5 minutes if a metal cutting tool is
fitted or about 3 minutes if a nylon
line cutting head is fitted.
:
Open the throttle wide.
:
At sea level
:
Use standard setting for metal
cutting tools.
:
Turn the high speed screw (H)
clockwise (leaner) no further than
stop until there is no noticeable
increase in engine speed.
Cutting tool rotates when engine is
idling
Turn the high speed screw (H)
counterclockwise (richer) no further
than stop until there is no noticeable
increase in engine speed.
It is possible that maximum engine
speed will already be reached with
the standard setting in each case.
Erratic idling behavior, engine stops
even though setting of LA screw is
correct, poor acceleration
:
Adjusting Idle Speed
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
:
Warm up engine.
Turn idle speed screw (LA) slowly
counterclockwise until cutting tool
stops rotating and then turn the
screw about another 1/2 to 1 turn in
the same direction.
Idle setting too lean:
Turn low speed screw (L)
counterclockwise (about 1/4 turn)
until the engine runs and
accelerates smoothly.
Erratic idling behavior
:
Idle setting too rich:
Turn low speed screw (L) clockwise
(about 1/4 turn) until the engine runs
and accelerates smoothly.
Engine stops while idling
:
FS 55
Turn idle speed screw (LA) slowly
clockwise until the engine runs
smoothly – cutting tool must not
rotate.
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