MAINTENANCE
Muffler
NOTE!
Some mufflers are fitted with catalytic converters. See “Tech- nical data” 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 inflammable mate- rial. Some mufflers are equipped with a special spark arrest screen. If your machine is fitted with this type of screen it should be cleaned regularly. This is done using a wire brush. 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 frequently blocked, this can
Cooling system
To maintain as low operat- ing 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 cylin- der).
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.
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be a sign that the function of the catalytic converter is impaired. Contact your dealer to inspect the muffler. A blocked screen will cause the engine to overheat resulting in damage to the cylinder and piston. Also see under
Spark plug
The condition of the spark plug is affected by:
•An incorrect carburettor 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.
“Maintenance”.
NOTE!
Never use a machine with a defective muffler.
!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!
If the machine is low on power, difficult to start or runs poorly while idling always check the spark plug first before taking other action.
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.
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