Stiga Chain-saw Operator's Manual page 18

MAINTENANCE AND STORAGE
(1a) and then fit these assembled parts on the
machine.
CHECKING THE SPARK PLUG (Fig. 24)
Periodically remove and clean the spark plug
using a metal brush to get rid of any deposits.
Check and reset the correct distance between
the electrodes.
Replace the spark plug and fasten it firmly using
the supplied wrench.
The spark plug must be replaced with one with
the same characteristics whenever the elec-
trodes have burnt or the insulation has worn, and
in any case every 100 working hours.
TUNING THE CARBURETTOR
The carburettor is tuned by the manufacturer to
achieve maximum performance in all situations,
with a minimum emission of toxic gas in compli-
ance with the regulations in force.
When performance is poor, first check that the
chain runs smoothly and the bar rails are not dis-
torted, then contact your dealer to check the
carburetion and the engine.
• Tuning minimum speed
WARNING!
!
The minimum speed must
only be tuned if the chain moves when the
engine idles.
Speed is reduced by turning the screw marked
"T" or "MIN - IDLE" anti-clockwise until the chain
stops moving. The engine should continue to run
as normal.
If the engine does not idle smoothly, turn the
screw clockwise to increase the speed.
WARNING!
!
The chain must not move
when the engine idles; contact your dealer if
you are not able to tune it to your satisfac-
tion.
SHARPENING THE CHAIN
WARNING!
!
saw works safely and efficiently, it is essential
that the cutting components are well-sharp-
ened.
Sharpening is necessary when:
• The sawdust looks like dust.
• Cutting becomes more difficult.
• The cut is not straight.
• Vibrations increase.
• Fuel consumption increases.
A specialized centre will sharpen the chain using
the right tools to ensure minimum removal of
material and even sharpness on all the cutting
edges.
If you sharpen the chain yourself, use special
round-section files with the right diameter
depending on the type of chain (see "Chain
Maintenance Table"). You need a certain amount
of skill and experience to avoid damaging the
cutting edges.
Sharpen the chain as follows (Fig. 25):
– Switch off the engine, release the chain brake
and secure the bar with the chain in a vice so
that the chain can run smoothly.
– Tighten the chain if it is loose.
– Mount the file in the guide and then insert it in
the tooth at a constant angle from the cutting
edge.
– Sharpen in a forward motion a few times and
repeat this on all the cutting edges facing the
same way (right or left).
– Turn the bar over in the vice and repeat on all
the other cutting edges.
– Check that the limiter tooth does not stick out
further than the inspection instrument and file
any projecting parts with a flat file, rounding
off the edge.
– After sharpening, remove all traces of filing
and dust and lubricate the chain in an oil bath.
Replace the chain whenever:
– The length of the cutting edges reduces to 5
mm or less;
– There is too much play between the links and
the rivets.
EN
To ensure that the chain-
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