English---16
115278026 Rev. 2 5/1/10
MAINTENANCE
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 (Y). If y our machine
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.
Carburetor
Your Jonsered 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
S The carburetor governs the engine’s
speed via the throttle control. Air and fuel
are mixed in the carburetor.
S The T--screw (X) 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
S 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.
X
CAUTION! Never use a machine that has
a faulty or loose muffler. Ensure the muf fler
bolts are tight.
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.
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