Carburettor Settings - Husqvarna 525BX Workshop Manual

Repair instructions
5. Connect the throttle cable on the carburettor
with the help of flat nose pliers. Check that
the cable sits correctly in the arm on the
carburetor(C) and that it sits correctly in the filter
cover(D).
6. Connect the fuel pipe from the tank.
Assemble the remaining parts in the reverse order
as set out for disman

7.17 Carburettor settings

WARNING!
Ensure the all covering parts (E/G
cover, guard net on volute cover are
assembled surely when testing the
engine. And nut for Fan is tighten
properly.
Function
The carburettor has the task of supplying a com-
bustible 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 carburettor 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 anticlockwise 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 anticlockwise gives a lower idling
speed.
NOTE!
A revolution counter should always be used to achieve optimal setting.
42
- English
D
T
C