18 – English
A muffler fitted 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
Muffler with catalytic converter
The muffler 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 fire
if the exhaust fumes are
directed towards a dry or
inflammable material. Some
mufflers are fitted with a
special spark arrest screen. If
your machine is fitted with this
type of muffler then the screen
should be cleaned at least
once a week. This is done
using a wire brush. If the
screen is damaged in any
way it should be replaced. If
the screen is blocked this will
result in engine overheating
and damage to the cylinder
and piston.
NOTE!
Never use a machine with a
defective muffler.
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!
Mufflers fitted 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 fire!
!
!
Cooling system
To maintain as low operating
temperature as possible the
engine is equipped with a
cooling system.
The cooling system consists
of:
1. An air intake on the starter
unit.
2. Cooling fins on the
flywheel.
3. Cooling fins on the
cylinder
4. Cylinder cover (leads cold
air onto the cylinder).
Clean the cooling system using
a brush at least once a week,
in difficult conditions more
often.
A dirty or blocked cooling
system leads to the engine
overheating resulting in
damage to the cylinder and
piston.
1
4
3
2

0,5 mm

If the machine is low on power, difficult to start or runs
poorly while idling always check the spark plug first.
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 neces-
sary.
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 filter.
These factors cause
deposits on the spark plug
electrode that may result
in malfunction or starting
difficulties.