MAINTENANCE
? The carburettor has three adjustment controls:
Carburettor adjustment
- L = Low speed jet
The carburettor can be designed in different ways, depending
on existing environmental and emissions legislation. Some - H = High speed jet
chain saws are equipped with movement limiters on the
- T = Idle adjustment screw
carburettor?s adjuster screws. These limit the adjustment
possibilities to a maximum of a 1/2 turn.
LH
1/2
1/2
When your chain saw is equipped with a carburettor that
features movement limiters, the carburettor should be
adjusted according to the instructions under the heading
Carburettor with movement limiters.
? The L and H-jets are used to adjust the supply of fuel to
When your chain saw is equipped with a carburettor that does match the rate that air is admitted, which is controlled with
not feature movement limiters, the carburettor should be the throttle. If they are screwed clockwise the air/fuel ratio
adjusted according to the instructions under the heading becomes leaner (less fuel) and if they are turned anti-
Carburettor without movement limiters.clockwise the ratio becomes richer (more fuel). A lean
mixture gives a higher engine speed and a rich mixture
gives a lower engine speed.
H
L
? The T-screw regulates the throttle setting at idle speed. If
the T-screw is turned clockwise this gives a higher idle
speed; turning it anti-clockwise gives a lower idle speed.
Basic settings and running in
Contact your servicing dealer (retailer) if you are
uncertain of which type of carburettor your chain saw is The basic carburettor settings are adjusted during testing at
equipped with.the factory. Avoid running at a too high speed during the Ţrst
10 hours.
Carburettor with movement limitersCAUTION! If the chain rotates while idling the T-screw
must be turned anti-clockwise until the chain stops.
HRec. idle speed: 2500 rpmL
1/2
WARNING! Contact your servicing dealer, if
1/2the idle speed setting cannot be adjusted so
!
that the chain stops. Do not use the chain
saw until it has been properly adjusted or
Your Husqvarna product has been designed and repaired.
manufactured to speciŢcations that reduce harmful
emissions.
Fine adjustment
Function, Basic settings, Fine adjustmentWhen the machine has been ?run-in? the carburettor should
be Ţnely adjusted. The Ţne adjustment should be carried out
by a qualiŢed person. First adjust the L-jet, then the idling
WARNING! Do not start the chain saw unless screw T and then the H-jet.
the bar, chain and clutch cover (chain brake)
!
are Ţtted, otherwise the clutch may come
Changing the type of fuel
loose and cause personal injury.
Fine tuning may be required if the chain saw, after changing
the type of fuel, performs differently with regard to starting,
Function
acceleration, maximum speed, etc.
? The carburettor governs the engine?s speed via the
throttle control. Air and fuel are mixed in the carburettor. Conditions
The air/fuel mixture is adjustable. Correct adjustment is
? Before any adjustments are made the air Ţlter should be
essential to get the best performance from the machine.
clean and the cylinder cover Ţtted. Adjusting the
? Adjusting the carburettor means that the engine is carburettor while a dirty air Ţlter is in use will result in a
adapted to local operating conditions, e.g. climate, leaner mixture next time the Ţlter is cleaned. This can give
altitude, petrol and the type of 2-stroke oil.rise to serious engine damage.
30 - English |
ACEC
HUSQVARNA
