36 – English
CARBURETTOR
WARNING!
Wear ear-muffs when making
adjustments with the engine running.
WARNING!
The bar, chain and clutch cover must be
fitted before the chainsaw is started,
otherwise the clutch can work loose and
cause personal injury.
Adjustment
L
H
T
!
!
Adjusting the carburettor means adapting the engine to local
conditions, e.g. the climate, altitude, petrol and the type of 2-
stroke oil.
The carburettor is fitted with three adjustment possibilities:
L = Low speed jet
H = High speed jet
T = Adjuster screw for idling
The quantity of fuel in relation to the air flow permitted by the
throttle opening is adjusted with the L and H jets. Turning them
clockwise gives a leaner fuel mixture (less fuel) and turning
them anticlockwise gives a richer air/fuel mixture (more fuel).
A lean mixture gives a higher speed, while a rich mixture
gives a lower speed.
The T-screw regulates the position of the throttle while the
engine is idling. Turning the T-screw clockwise gives a higher
idling speed, while turning it anticlockwise gives a lower idling
speed.
Basic settings and running-in
The basic carburettor settings are used for test running in the
factory.
The basic settings are H = 1
1
⁄
4
and L = 1
1
⁄
4
turns
respectively.
To ensure that the engine components receive adequate
lubrication (running-in) the carburettor should be set to
a somewhat richer fuel mixture for the first 3-4 hours the
chainsaw is used. To achieve this, the max. overspeed is
adjusted to 6-700 rpm less than the recommended max.
overspeed.
If it is not possible to check the max. overspeed with a
tachometer then the H-jet should not be set to a leaner
mixture than stated in the basic settings.
The recommended max. overspeed must not be exceeded.
NOTE! If the chain goes round at idling speed the T-screw
should be turned anticlockwise until it stops.
Conditions
The air filter should be clean and the cylinder cover fitted
when adjustments are made. Adjusting the carburettor with
a dirty air filter will give a fuel mixture that is too lean the next
time the air filter is cleaned. This can result in serious damage
to the engine.
Carefully screw in (clockwise) the L and H jets until they
bottom. Now screw out (anticlockwise) the jets 1 turn. The
carburettor now has the setting H = 1 and L = 1.
Start the chainsaw according to the starting instructions and
run warm for 10 minutes.
NOTE! If the chain goes round at idling speed
the T-screw should be turned anticlockwise
until it stops.
Place the chainsaw on a flat surface so that the bar points
away from you and so that the chain and bar are not in contact
with the surface or any other object.
Fine adjustment of the carburettor should be carried out after
the engine has been “run-in”. First adjust the L-jet, then the
idling speed’s T-screw, and finally the H-jet.
The following speed recommendations apply:
Max. overspeed Idling speed
CS2186 13 000 rpm 2 700 rpm
Fine adjustment
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