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Adjusting the Carburetor
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.
The high speed adjusting screw on this carburetor can only be set within narrow limits.
Standard position
NSwitch off the engine
NCheck the air filter – clean or replace it if necessary
NCheck the spark arresting screen in the muffler (present only in some countries) – clean or replace it if necessary
38
H
L
0012BA016 KN
NTurn the high speed screw (H) counterclockwise as far as possible (max. 3/4 turn)
NTurn the low speed screw (L) gently clockwise until it is firmly in its seat.
NOpen the low speed screw (L) 1 full turn
Setting the idle speed
Engine stops when idling
NSet low speed screw (L) to standard setting
0012BA017 KN
NTurn the idle speed adjusting screw (LA) clockwise until the saw chain begins to rotate – then turn it back 1 1/2 turns
Saw chain rotates at idle speed
NBefore adjustment, let the machine idle for 20 seconds
NSet low speed screw (L) to standard setting
NTurn the idle speed screw (LA) counterclockwise until the saw chain stops turning – then turn another 1 1/2 turns in the same direction
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
NBefore adjustment, let the machine idle for 20 seconds
NSet low speed screw (L) to standard setting
NIdle speed setting is too lean – turn the low speed screw (L) counterclockwise until the engine runs and accelerates smoothly
Whenever the low speed screw (L) has been adjusted, it is usually also necessary to adjust the idle speed adjusting screw (LA).
Adjustment for use in the mountains or at sea level
A marginal adjustment may be necessary if the engine does not run satisfactorily in the mountains or at sea level:
NCheck the standard setting N Let the engine warm up
MS 201, MS 201 C