Jonsered FC2145W - Manual (Page 33)

MAINTENANCE
English – 33
Spark plug
The spark plug condition is influenced by:
• Incorrect carburettor adjustment.
• An incorrect fuel mixture (too much or incorrect type
of oil).
• A dirty air filter.
These factors cause deposits on the spark plug
electrodes, which may result in operating problems and
starting difficulties.
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.
CAUTION! 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.
Winter use
Running problems can occur when using the machine in
the cold and snowy conditions caused by:
• Too low engine temperature.
• Icing of the air filter and carburettor.
Special measures are therefore often required:
• Partly mask the air inlet on the starter to increase the
working temperature of the engine.
• Preheat the intake air to the carburettor by using the
heat from the cylinder.
Temperature 5
°C or colder:
The air filter holder is prepared so it can be changed for
use in the cold. Remove the air filter cover and air filter.
Turn the winter cover anticlockwise using a screwdriver so
that the preheated air from the engine can pass inside the
carburettor compartment and prevent, for example, the air
filter from icing up (see figure).
For temperatures below 5 °C and/or in snow conditions
there is also:
• a special cover for the starter housing
These reduce the cooling air and prevent large amounts
of snow from being sucked into the engine.
IMPORTANT! The machine MUST be returned to its
standard design at temperatures warmer than 5
°C .
Otherwise there is a risk of overheating resulting in
serious engine damage.