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WARNING
Q The
cutting
attachment
may
be spinning
during
carburetor
adjustments,
Q Never start
the engine
without
the complete
clutch cover and tube assembled!
Otherwise
the clutch can come loose and cause personal
injuries,
In the carburetor,
fuel is mixed with air. When the
engine is test run at the factory, the carburetor
is
basically
adjusted.
A further
adjustment
may be
required,
according
to climate
and altitude.
The
carburetor has one adjustment possibility:
T = Idle speed adjustment
screw.
Idle speed adjustment
(T-Screw)
Check that the air filter is clean. When the idle speed
is correct, the cutting attachment
will not rotate, tf
adjustment is required, close (clockwise) the T-screw,
with the engine running, until the cutting attachment
starts to rotate. Open (counter-clockwise)
the screw
until the cutting attachment stops. You have reached
the correct idle speed when the engine runs smoothly
in all positions
well below the rpm when the cutting
attachment
starts to rotate.
If the cutting attachment
still rotates after idle speed
adjustment,
contact your Hitachi dealer.
NOTE
Standard Idle speed is 2,800 - 3,200 min -1.
WARNING
When
the
engine
is
idling
the
cutting
attachment
must
under
no circumstances
rotate,
Air filter (Fig, 20)
The air filter must be cleaned from dust and dirt in
order to avoid:
© Carburetor malfunctions
O Starting problems
O Engine power reduction
© Unnecessary wear on the engine parts
O Abnormal fuel consumption
Clean the air filter daily or more often if working in
exceptionally
dusty areas.
19
Fig. 20
Cleaning
the air filter
Remove the air filter cover and the filter (19). Rinse it
in warm soap suds. Check that the filter is dry before
reassembly. An air filter that has been used for some
time cannot be cleaned completely. Therefore, it must
regularly be replaced with a new one. A damaged
filter must always be replaced.
Fuel filter
(Fig. 21)
Drain all fuel from fuel tank and pull fuel filter line from
tank. Pull filter element out of holder assembly
and
rinse element in warm water with detergent.
Rinse thoroughly
until all traces
of detergent
are
eliminated.
Squeeze,
do not wring, away excess
water and allow element to air dry.
NOTE
If element is hard due to excessive dirt buildup,
replace it.
\
Fig. 21
Spark plug (Fig. 22)
The spark plug condition is influenced by:
O An incorrect carburetor setting
O Wrong fuel mixture (too much oil in the gasoline)
O A dirty air filter
O Hard running conditions
(such as cold weather)
These
factors cause deposits
on the spark plug
electrodes,
which
may result in malfunction
and
starting difficulties.
If the engine is low on power,
difficult to start or runs poorly at idling speed, always
check the spark plug first. If the spark plug is dirty,
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