2. Remove the sediment cup (B) and the O-ring (C).
B
C
A
3. Clean the sediment cup and the O-ring in solvent
that is not flammable.
4. Let the sediment cup and the O-ring dry fully.
5. Put the O-ring in the fuel valve and install the
sediment cup. Tighten the sediment cup fully.
6. Move the fuel valve to the ON position.
7. Examine the sediment cup for leaks. Replace the O-
ring if there is leakage.
To examine and replace the spark plug
CAUTION: Do not try to start the engine if
the spark plug or ignition cable is removed.
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 or if the insulation has cracks or
damages. If the spark plug is not damaged, clean it
with a steel brush.
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: Spark plugs that are not
tightened correctly can cause
damage to the engine.
7. Install the spark plug cap.
To adjust the idle speed
1. Start the engine outdoors and let it become warm.
2. Move the throttle control to the low speed position.
3. Use a tachometer to do a check of the idle speed.
Refer to
Technical data on page 17
for correct idle
speed.
4. Turn the idle speed screw (A) clockwise to adjust the
idle speed.
A
To do a check of the spark arrestor
screen
WARNING: In some areas and conditions,
you must use a spark arrestor screen to
prevent the risk of fire. Obey local
regulations.
1. Remove the 3 screws from the exhaust deflector and
remove the exhaust deflector.
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13
Summary of Contents for HH 163MP
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