Zenoah GZ4350, Workshop Manual

Page: 42 / 62

41
- English
Repair Instructions
Adjustment
WARNING!
The guide bar, saw chain and
clutch cover must be fitted before
the chain saw is started, other-
wise the clutch may come loose
causing personal injury.
WARNING!
Wear ear defenders when making
adjustments with the engine run-
ning.
!
!
!
NOTE!
If the saw chain turns when idling, the
T-screw should be turned anti-clockwise
until the saw chain stops.
WARNING!
Do not use the chain saw until
it has been adjusted so that the
saw chain is still during idling.
NOTE!
For optimal setting, a tachometer should
be used. The recommended maximum
overspeed should not be exceeded.
Adjusting the carburettor involves adjusting the
engine to the local conditions e.g. climate, altitude,
fuel and type of 2-stroke oil.
The carburettor is equipped with three adjustment
options:
L = Low speed jet
H = High speed jet
T = Idling adjustment
The L- and H-jets adjust the fuel flow to match
the airflow that the throttle valve opening allows.
Turning them clockwise makes the fuel/air mixture
weaker (less fuel) and turning them counter-
clockwise makes the fuel/air mixture richer (more
fuel). A weaker mixture increases the engine speed
and a rich mixture decreases the engine speed.
The T- screw controls the throttle position when
idling. Turning the T-screw clockwise gives faster
idling, turning it counterclockwise gives lower idling
speed.
Run the chain saw for approx. 10 minutes before
adjusting the carburettor.