Troubleshooting - Husqvarna HV 703 Operator's Manual

2. Pull the fuel filter from the ends of the fuel hoses
(C).
3. Push the new fuel filter into the ends of the fuel
hoses.
a) If there are marks for the direction of
installation on the fuel filter, make sure that
it is installed in the correct direction.
4. Push the hose clips against the fuel filter.
To examine and replace the spark
plug
CAUTION:
engine if the spark plug or ignition cable
is removed.
Note:
The engine has 2 spark plugs.
1. Remove the spark plug cap and clean around the
spark plug.
2. Remove the spark plug with a spark plug wrench.
3. Examine the spark plug. Replace it if the
electrodes are burned, damaged or dirty or if the
insulation has cracks or damages.
4. Measure the electrode gap and make sure that it
is correct. Refer to
a) If it is necessary, bend the side electrode to
adjust the electrode gap.
5. Install the spark plug by hand until it touches the
spark plug seat.
6. Tighten the spark plug with the spark plug
wrench.
a) Tighten a used spark plug ⅛–¼ of a turn
more, and a new spark plug ½ turn more.
CAUTION:
are not tightened correctly can
cause damage to the engine.
The engine does not start
Cause
The fuel valve lever is set to the OFF position.
8
Do not try to start the
Technical data on page 11 .
Spark plugs that

Troubleshooting

7. Install the spark plug cap.
Carburetor adjustment for high
altitude operation
The altitude has an effect on the engine performance
and emissions. If the engine is always operated at
altitudes higher than 1500 m/5000 ft, it is necessary
to adjust the carburetor. Let your servicing dealer do
the necessary adjustments.
CAUTION:
engine on lower altitudes if the
carburetor is adjusted for high altitudes.
This causes engine damage. Let your
servicing dealer adjust the carburetor to
factory specifications.
Emission control system
This engine uses lean carburetor adjustments
and other systems to decrease the emissions of
dangerous materials in the exhaust fumes. The air
intake, the fuel system and the exhaust system are
parts of the emission control system. If modifications
are done to the emission control system, the
emissions increase.
If modifications are done to the speed adjustment
mechanism or governor linkage, the engine does not
operate as intended. This can also cause increased
emissions.
It is necessary to use original spare parts to make
sure that the emission control system operates
correctly.
The engine must be examined and repaired by an
approved servicing dealer if 1 or more of these
problems occur:
• The engine is not easy to start or stops again
after a start.
• The engine does not operate smoothly at idle
speed.
• There are misfires in the engine during operation.
• The exhaust smoke is black or the fuel
consumption is high.
Solution
Move the fuel valve lever to the ON position.
Do not operate the
1974 - 001 - 09.12.2022