Maintenance; General; Carburettor; Muffler - Husqvarna 425 BVS Operator's Manual

General

Remove the ignition cable and the spark plug to carry out
inspection and maintenance. Keep all parts of your body
away from hot surfaces.

Carburettor

Adjustment of the idle speed
Before any adjustments are made, make sure that the air
filter is clean and the air filter cover is fitted.
When the engine tends to stop frequently at an idle mode,
turn the adjusting screw clockwise.
1 Adjusting the idle speed
2 Cable adjustment
IMPORTANT! warm up the engine before adjusting the
idle speed.
Muffler
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.
The muffler is equipped with a special spark arrestor
mesh. The spark arrestor mesh should be cleaned once
a month. This is best done with a wire brush.

MAINTENANCE

CAUTION! Never use a machine with a defective muffler.
Check regularly that the muffler is complete and secured
correctly. Tightening torque 7 - 10 Nm
!
Clean the muffler.
• After every 50 hours of use the muffler must be
cleaned.
• Remove the muffler, insert a screwdriver into the vent,
and wipe away any carbon builup. Wipe away any
carbon buildup on the muffler exhaust vent and
cylinder exhaust vent at the same time.
• Make sure all nuts and bolts are tightened correctly.

Cooling system

To keep the working temperature as low as possible the
machine is equipped with a cooling system.
The cooling system consists of:
• Cooling fins on the cylinder.
• Air intake screen
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. Check that the nozzles
are not blocked.
WARNING! The muffler gets 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!
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