KA 85 R
English
43
Rule of thumb:
Turn the high speed screw (H) about
one quarter turn for every 1000 m (3300
ft) change in altitude.
Conditions for adjustment
N
Carry out the standard setting.
N
Start and warm up the engine: For
about 5 minutes if you are using a
metal cutting attachment or about 3
minutes if you are using a mowing
head.
N
Open the throttle wide.
At high altitude
N
Turn the high speed screw (H)
clockwise (leaner), no further than
stop, until there is no noticeable
increase in engine speed.
At sea level
N
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 may be reached with the standard
setting in each case.
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).
N
Warm up the engine.
Engine stops while idling
N
Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the working tool or
cutting attachment must not move.
Cutting attachment runs when engine is
idling
N
Turn the idle speed screw (LA)
counterclockwise until the working
tool or cutting attachment stops
moving and then rotate the screw
another 1/2 to 1 turn in the same
direction.
WARNING
If the working tool or cutting attachment
continues to run when the engine is
idling, have your machine checked and
repaired by your servicing dealer.
Erratic idling behavior, engine stops
even though setting of LA screw has
been corrected, poor acceleration
Idle setting is too lean
N
Rotate the low speed screw (L)
about 1/4 turn counterclockwise
until the engine runs and
accelerates smoothly.
Erratic idling behavior
Idle setting is too rich
N
Rotate the low speed screw (L)
about 1/4 turn clockwise until the
engine runs and accelerates
smoothly.
In some countries replacement mufflers
may be equipped with an integral spark
arresting screen.
If the engine is down on power, check
the spark arresting screen in the muffler.
N
Lift the spark arresting screen and
pull it out.
N
Clean the spark arresting screen. If
the screen is damaged or heavily
carbonized, fit a new one.
N
Refit the spark arresting screen.
Spark Arresting Screen in
Muffler
392BA035 KN
