MAINTENANCE
Muffler
Cooling system
NOTE!
Some mufflers are fitted with a catalytic converter. See
“Technical data” to see whether your machine is fitted 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 material. Some mufflers are equipped with a
To maintain as low opera- ting 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).
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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
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.
Spark plug
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 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
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.
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cylinder and piston. Also see under “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.
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.
Two-part shaft
The end of the drive axle in the lower shaft should be lubricated with grease every 30 hours. There is a risk that the drive axle ends (splined coupling) on
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