Carburetor, Settings; Carburetor Settings - Husqvarna 525P4S Workshop Manual

Repair instructions
5. Connect the throttle cable on the carburetor with
the help of flat nose pliers. Check that the cable
sits correctly in the guide on the clutch housing
(A) and that it sits correctly in the cut-out (B) of
the insulator.
6. Connect the fuel pipe between the fuel pump
and the carburetor.
Assemble the remaining parts in the reverse order
as set out for disman

7.16 Carburetor settings

WARNING!
When testing the engine in
connection with carburetor
adjustment, the clutch and clutch
cover must be mounted together
with the shaft and bevel gear under
all circumstances
Otherwise there is a risk of the
clutch becoming loose resulting in
serious personal injury.
Function
The carburetor has the task of supplying a combus-
tible fuel/air mixture to the engine.
The amount of this mixture is controlled by the
throttle.
The mixture's composition of fuel and air is
controlled by means of the adjustable "H" and "L"
needles.
The needles must be correctly adjusted in order
for the engine to give maximum power at different
speeds, run steadily while idling and to react
quickly when accelerating.
The setting of the carburetor can vary a little
depending on the humidity, temperature and air
pressure.
L = Low speed needle
H = High speed needle
T = Idle adjustment screw
• The fuel quantity in relation to the air flow
permitted by the throttle opening is adjusted by
the L and H jets. Turning the needles clockwise
gives a leaner fuel mixture (less fuel) and
turning them counter clockwise gives a richer
fuel mixture (more fuel). A leaner mixture gives
higher revs while a richer mixture gives less
revs.
• The T-screw regulates the position of the throttle
while the engine is idling. Turning the screw
clockwise gives a higher idling speed while
turning it counter clockwise gives a lower idling
speed.
NOTE!
A revolution counter should always be used to achieve optimal setting.
44
- English
A
A
B
B