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7
The engine must return to idle speed
whenever the throttle lever is released.
Idle speed is adjustable, and must be set
low enough to permit the engine clutch to
disengage the cutters.
Adjusting Engine Idle
Stopping the Engine
Idle
Adjustment
Screw
1. Cool the engine by allowing it to idle for
2–3 minutes.
2. Move the ignition switch to the “O” or
STOP position. See Figure 11.
WARNING!
The cutters must NEVER engage at
engine idle speeds! If the idle speed
cannot be adjusted by the above
procedure, return the trimmer to your
dealer for inspection.
Idle Speed Adjustment
1. Start the engine, and then allow it to idle
2–3 minutes until warm.
2. If the cutters move when the engine is
at idle, reduce idle speed by turning the
idle adjustment screw counterclockwise.
3. If a tachometer is available, the engine
idle speed should be final-adjusted to
3,000 ±250 rpm (min
-1
).
4. Carburetor fuel mixture adjustments
are preset at the factory and cannot be
adjusted or serviced in the field.
Figure 10
Starting a Flooded Engine
Spark
Plug
Spark Plug
Lead
CAUTION!
Incorrect spark plug installation can
damage the engine!
1. Disconnect the spark plug lead, and
then use the spark plug wrench to
loosen and remove the spark plug.
2. If the spark plug is fouled or is soaked
with fuel, clean or replace the plug as
necessary. For spark plug specifications
and gapping procedure, see page 9.
3. With the spark plug removed, crank the
engine several times to clear excess fuel
from the combustion chamber.
WARNING!
Burn danger from hot engine! Allow
engine to cool before removing
cylinder cover.
Figure 9
4. Replace the spark plug and tighten it
firmly with the spark plug wrench. If a
torque wrench is available, torque the
spark plug to 170-190 kg cm.
5. Repeat the starting procedures for a
warm engine.
6. If the engine still fails to start or fire,
refer to the troubleshooting chart at the
end of this manual.
DH2510
Figure 11
HT2510
Ignition OFF
Ignition
Switch
Ignition
Switch
Ignition OFF