Tuning The Carburettor - Stiga SPR 255 Manual De Instrucciones

MAINTENANCE AND STORAGE
To clean the filter:
– Unscrew the knob (1).
– Remove the lid (2) and the filter element (3).
– Gently tap the filter element (3) to remove the
dirt and, if necessary, clean it with low pressure
compressed air.
IMPORTANT
never be washed and must be replaced if it is too
dirty or damaged.
– Reassemble the filter element (3) and the lid (2).
– Screw the knob (1) back on.
CHECKING THE SPARK PLUG (Fig. 23)
The spark plug can be accessed by removing the
air filter cover.
Periodically remove and clean the spark plug us-
ing 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 electrodes
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.
Chain maintenance table
WARNING!
are shown in the "EC Conformity Statement" provided. Do not use other types of chains or bars
for safety reasons.
The table gives the sharpening data for different types of chains, but this does not mean you
can use different chains from the homologated one.
Chain pitch
inches
3/8
1/4
The filter element (3) must
The specifications of the chain and the bar homologated for this machine
Limiter tooth level (a)
inches
0,025
0,025
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 car-
buretion and the engine.
• Tuning minimum speed
WARNING!
when the engine is running idle. If the chain
moves when the engine is running idle, con­
tact your dealer to correctly regulate the en­
gine.
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.
WARNING!
ciently sharpened, the kick-back's risk in­
creases.
A specialized centre will sharpen the chain using
the right tools to ensure minimum removal of mate-
rial and even sharpness on all the cutting edges.
a a
mm inches
0,64
0,64
The chain must not move
To ensure that the chain­
If the chain is not suffi­
File diameter (d)
d d
mm
5/32 4,0
5/32 4,0
17
EN