55Series 4144 Components FC, FS, KM
The limiter caps must be in their pre-
installed positions above and below
the stop, b 8.4.5.
– After completing the basic
setting, push the limiter caps fully
on to the adjusting screws.
: Do not push the limiter caps up
against the carburetor body since
they will otherwise be damaged.
Clearance 'a' (arrow) must be at
least 1 mm.
The range of adjustment of the high
speed screw (H) and low speed
screw (L) is now limited.
The basic setting of the high speed
screw (H) and low speed screw (L)
is now fixed.
545RA020 TG
1
a
1
8.5.2 Standard Setting
The limiter caps must not be
removed for the standard setting.
Always perform the following steps
before carrying out any
adjustments:
– Troubleshooting, b 4.4
– Mount the deflector and cutting
tool (mowing head), see
instruction manual
– the cutting tool must turn freely,
clean it if necessary.
– Inspect the spark arresting
screen (if fitted) and clean or
replace if necessary. b 5.8
– Check the air filter and clean or
replace if necessary, b 8.1
545RA125 TG
Standard Setting
– Shut down the engine.
– Turn the high speed screw (H)
slowly counterclockwise as far as
stop, but not more than a
3/4 turn.
– Turn the low speed screw (L)
slowly clockwise as far as stop,
but not more than a
3/4 turn.
Check running behavior:
The engine must idle and
accelerate smoothly.
Adjusting engine idle speed
– Allow engine to warm up.
Engine stalls at idle speed
– Turn the idle speed screw (LA)
clockwise until the engine runs
smoothly
– the cutting tool must not rotate.
Cutting tool rotates when engine
is idling
– Turn the idle speed screw (LA)
counterclockwise until the cutting
tool stops rotating – then turn the
screw another full turn in the
same direction.
Erratic idling behavior, engine
stops even though setting of LA
screw has been corrected, poor
acceleration
Idle setting is too lean.
– Turn the low speed screw (L)
counterclockwise, no further than
stop, until the engine runs and
accelerates smoothly.
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