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18 – English
A muffl er fi tted with a catalytic converter reduces the extent of
the following substances in the exhaust fumes:
• Hydrocarbons (HC). Some hydrocarbons in gasoline and the
exhaust are carcinogenic.
• Nitric oxides (NO). Irritating for the breathing air-ways.
• Aldehydes. The most common formaldehyde, is carcinogenic
and causes hypersensitiveness.
NOTE! The level of carbon monoxide is not reduced. This is an
odourless and extremely poisonous substance. Therefore avoid
exposure without good air circulation.
MAINTENANCE
Muffl er with catalytic converter
The muffl er is also 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 fi re
if the exhaust fumes are di-
rected towards a dry or infl am-
mable material. Some muffl ers
are fi tted with a special spark
arrest screen. If your machine
is fi tted with this type of muf-
fl er then the screen should be
cleaned at least once a week.
This is done using a wire
brush. If the screen is dam-
aged in any way it should
be replaced. If the screen is
blocked this will result in en-
gine overheating and damage
to the cylinder and piston.
NOTE!
Never use a machine with a
defective muffl er.
WARNING!
The coating on/in the catalytic element can
be hazardous to health if consumed. Wear
gloves when carrying out service work on the
catalytic converter.
WARNING!
Muffl ers fi tted with catalytic converters
become extremely hot during use and after
stopping. This also applies at idling speeds.
Contact can result in burns to the skin. Be
observant to the risk of fi re!
!
!
Cooling system
To maintain as low operating
temperature as possible the
engine is equipped with a cool-
ing system.
The cooling system consists
of:
1. An air intake on the starter
unit.
2. Cooling fi ns on the fl y-
wheel.
3. Cooling fi ns on the cylin-
der
4. Cylinder cover (leads cold
air onto the cylinder).
Clean the cooling system using
a brush at least once a week,
in diffi cult conditions more
often.
A dirty or blocked cooling
system leads to the engine
overheating resulting in
damage to the cylinder and
piston.
0,5 mm
If the machine is low on power, diffi cult to start or runs
poorly while idling always check the spark plug fi rst.
If the spark plug is dirty, clean it and at the same time check that
the electrode gap is 0.5 mm. The spark plug should be changed
after about one month of operation or earlier if necessary.
NOTE! Always use the recommended type of spark plug. An
incorrect spark plug can damage the cylinder/piston.
Spark plug
The condition of the spark
plug is affected by:
• An incorrect carburetor
setting.
• An incorrect fuel mixture
(too much or faulty oil).
• A dirty air fi lter.
These factors cause
deposits on the spark plug
electrode that may result
in malfunction or starting
diffi culties.