MS 720
English
29
Basic information
The carburetor comes from the factory
with a standard setting.
The carburetor has been adjusted for
optimum performance and fuel
efficiency in all operating states.
Standard setting
N Switch off the engine
N Check the air filter – clean or replace
it if necessary
N Carefully turn both adjusting screws
clockwise until they are seated
firmly (clockwise)
N Open the high speed screw (H)
1 full turn
N Open the low speed screw (L) 1 full
turn
Setting the idle speed
N Make standard setting
N Start engine and let it warm up
Engine stops when idling
N Turn the idle speed adjusting
screw (LA) clockwise until the saw
chain begins to turn – then turn it
back 1/4 turn
Saw chain rotates at idle speed
N Turn the idle speed screw (LA)
counterclockwise until the chain
stops running – then turn another
1/4 turn in the same direction.
WARNING
If the saw chain continues to keep
rotating in idle even after adjustment,
have the chain saw checked by a
servicing dealer.
Speed erratic when idling, poor
acceleration (despite low speed
adjusting screw = 1)
The idle setting is too lean.
N Turn the low speed adjusting
screw (L) counterclockwise until the
engine runs smoothly and
accelerates properly.
Whenever the low speed adjusting
screw (L) has been adjusted, it is usually
also necessary to readjust the idle
speed adjusting screw (LA).
Correcting the carburetor setting for use
at high altitudes
The setting may have to be marginally
corrected if engine performance is
unsatisfactory at high altitudes:
N Make standard setting
N Let the engine warm up
N Turn the high speed adjusting
screw (H) slightly clockwise (leaner)
– max. up to the stop
NOTICE
After descending from a high altitude,
restore the carburetor setting to the
standard setting.
If the setting is too lean, the engine may
be damaged by overheating and a
shortage of lubricant.
Adjusting the Carburetor
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