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: tmproper mainte-
nance could result in serious engine
damage or in serious injury.
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 witl
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 idlespeed using the idle adjust-
ment T-screw if it is necessary to readjust.
The idlespeed iscorrectly adjusted when
the engine wilt run smoothly inevery 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 use£ 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 cieaned regulady. 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
cieaned 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 wiil cause the
engine to overheat resulting in damage to
the cyiinder and piston
CAUTION! Never use a machine that has
a faulty or loose muffler. Ensure the muffler
bolts are tight.
545154659 Rev. 3 7/1/08 English-16
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