The spark plug condition is inﬂuenced by:
Incorrect carburettor adjustment.
An incorrect fuel mixture (too much or incorrect type of
A dirty air ﬁlter.
These factors cause deposits on the spark plug
electrodes, which may result in operating problems and
If the machine is low on power, difﬁcult to start or runs
poorly at idle speed: always check the spark plug ﬁrst
before taking any further action. If the spark plug is dirty,
clean it and check that the electrode gap is 0.5 mm. The
spark plug should be replaced after about a month in
operation or earlier if necessary.
Note! Always use the recommended spark plug type! Use
of the wrong spark plug can damage the piston/cylinder.
Check that the spark plug is ﬁtted with a suppressor.
Lubricating the bar tip sprocket
Lubricate the bar tip sprocket each time you refuel. Use
the special grease gun and a good quality bearing grease.
36 – English
Needle bearing lubrication
The clutch drum has a needle bearing on the output shaft.
This needle bearing must be lubricated regularly.
When lubricating, remove the clutch cover by loosening
the two bar nuts. Lay the saw on its side with the clutch
Lubrication involves engine oil dripping into the centre of
the clutch drum as it rotates.
To keep the working temperature as low as possible the
machine is equipped with a cooling system.
The cooling system consists of:
Air intake on the starter.
Air guide plate.
Fins on the ﬂywheel.
Cooling ﬁns on the cylinder.
Cylinder cover (directs cold air over the cylinder).
Clean the cooling system with a brush once a week, more
often in demanding conditions. A dirty or blocked cooling
system results in the machine overheating which causes
damage to the piston and cylinder.
115 13 81-26 Rev.3 2009-01-14