Spark Plug; Air Filter; Bevel Gear - Husqvarna 129R Operator's Manual

The muffler is designed to reduce the noise level
and to direct the exhaust gases away from the
operator. The exhaust gases are hot and can
contain sparks, which may cause fire if directed
against dry and combustible material.
Mufflers are equipped with a special spark arrestor
mesh. The mesh should be checked and, if
necessary, cleaned by a servicing dealer. If the
mesh is damaged, it should be replaced.
If the mesh is frequently blocked, this can be a
sign that the performance of the catalytic converter
is impaired. Contact your servicing dealer to
inspect the muffler. A blocked mesh will cause the
machine to overheat and result in damage to the
cylinder and piston.
CAUTION: Never use a machine that has a
faulty or loose muffler. Ensure the muffler bolts
are tight.
WARNING: Mufflers fitted with catalytic
converters get very hot during use and
remain so for some time after stopping.
This also applies at idle speed. Contact
can result in burns to the skin. Remember
the risk of fire!
WARNING: The inside of the muffler
contain chemicals that may be
carcinogenic. Avoid contact with these
elements in the event of a damaged
muffler.
WARNING: Engine exhaust fumes
contain carbon monoxide, which can
cause carbon monoxide poisoning. Do
not start or run the machine indoors, or
anywhere that is poorly ventilated.
The exhaust fumes from the engine are
hot and may contain sparks which can
start a fire. Never start the machine
indoors or near combustible material!

Spark plug

The spark plug condition is influenced by:
• incorrect carburetor 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.
MAINTENANCE
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 0.024 inch (0.6 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.

Air filter

The air filter must be regularly cleaned to remove
dust and dirt in order to avoid:
carburetor malfunctions
•
starting problems
•
loss of engine power
•
unnecessary wear to engine parts
•
excessive fuel consumption
•
Clean the filter every 25 hours, or more regularly if
conditions are exceptionally dusty.
Cleaning the air filter
Remove the air filter cover and take out the filter.
Wash it clean in warm, soapy water. Rinse
thoroughly. Ensure that the filter is dry before
refitting it.
An air filter that has been in use for a long time
cannot be cleaned completely. The filter must
therefore be replaced with a new one at regular
intervals. A damaged air filter must always be
replaced.

Bevel gear

The bevel gear is filled with the right quantity of
grease at the factory. However, before using the
machine you should check that the bevel gear is
filled three-quarters full with grease. Use special
grease. The grease in the bevel gear does not
normally need to be changed except if repairs are
carried out.