MS 651
English
33
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 Turn the high speed adjusting
screw (H) clockwise as far as
possible - then turn it 1 1/2 turns
counterclockwise
N Turn the low speed adjusting
screw (L) clockwise as far as
possible – then turn it 1 turn
counterclockwise
Setting the idle speed
N Set to the 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 run – 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 standard setting of
low speed adjusting screw)
The idle setting is too lean.
N Carefully 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 Set to the standard setting
N Let the engine warm up
N Turn the high speed adjusting
screw (H) slightly clockwise (leaner)
– max. 3/4 turns
NOTICE
After descending from a high altitude,
restore the carburetor setting to the
standard setting.
If you make the setting too lean it will
increase the risk of engine damage
through lack of lubrication and
overheating.
Adjusting the Carburetor
H
L
LA
1166BA013 AM
H
L
LA
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