Maintenance; Maintenance Safety; Carburetor; Basic Setting - Husqvarna 125BV x-series Operator's Manual

MAINTENANCE
Maintenance Safety
The owner is responsible for the perfor-
mance of all required maintenance as
defined in the operator's manual.
Disconnect the spark plug before perform-
ing maintenance, except carburetor adjust-
ments.
WARNING:
Improper mainte-
nance could result in serious engine
damage or n ser ous njury.
Carburetor
Your Husqvarna product has been designed
and manufactured to specifications that re-
duce harmful emissions. After the engine
has used 8-10 tanks of fuel, the engine will
be run-in. To ensure that it continues to run
at peak performance and to minimize harm-
ful exhaust emissions after the run-in peri-
od, ask your servicing dealer to adjust your
carburetor.
Function
• The carburetor governs the engine's
speed via the throttle control. Air and fuel
are mixed in the carburetor.
• The T-screw (BB) regulates the throttle
setting at idle speed. If the T-screw is
turned clockwise this gives a higher idle
speed; turning it counterclockwise gives a
lower idle speed.
Basic setting
• The basic carburetor settings are ad-
justed during testing at the factory. Fine
adjustment should be carried out by a
skilled technician.
Recommended idle speed:
See "Technical data" section.
Recommended max. speed:
See "Technical data" section.
Fine adjustment of the idle speed-T
Adjust the idle speed using the idle adjust-
ment T-screw if it is necessary to readjust.
The idle speed is correctly adjusted when
the engine will run smoothly in every posi-
tion.
BB
Muffler
Some mufflers are fitted with catalytic con-
verters. See the Technical data section to
find out if your machine is equipped with a
catalytic converter.
The muffler is designed to dampen the
noise level and to direct the exhaust fumes
away from the user. The exhaust fumes
are hot and can contain sparks, which can
result in fire if the exhaust fumes are
directed towards a dry and flammable
material.
Some mufflers are equipped with a special
spark arresting screen (CC). If your ma-
chine is fitted with this type of screen, it
should be cleaned regularly. To access the
screen, remove the outlet cover on the
front of the muffler. Use a wire brush to
clean the screen. On mufflers without a
catalytic converter the screen should be
cleaned weekly, or replaced if necessary.
On mufflers fitted with a catalytic converter
the screen should be checked and cleaned
monthly. If the screen is damaged it
should be replaced. If the screen is fre-
quently blocked, this can be a sign that the
function of the catalytic converter is im-
paired. Contact your dealer to inspect the
muffler. A blocked screen will cause the
engine to overheat resulting in damage to
the cylinder and piston.
CAUTION! Never use a machine that has
a faulty or loose muffler. Ensure the muffler
bolts are tight.
545186705 Rev. 3 7/1/08 English-16