GB-19
BK3420FL-EZ
G
B
9. Maintenance
■
AIR CLEANER
Take off the air-cleaner cover and remove the dust inside
the air cleaner every 25 hours of use.
When the air-cleaner element has become extremely
contaminated, clean it thoroughly with warm water includ-
ing a neutral detergent. Install it after drying it com-
pletely.
When the air-cleaner element has become deformed or
damaged, replace it with a new one.
Part No.: Z1418-82130
IMPORTANT
If the air-cleaner element becomes clogged, the output
of the engine decreases and fuel consumption worsens.
If you continue to operate the machine without an air-
cleaner element, or with an air-cleaner element which
has been deformed or damaged, the inside of the en-
gine will wear severely.
(1) Air-cleaner element
■
FUEL FILTER
WARNING
When you mount or dismount the fuel filter, be care-
ful not to damage the rubber packing. A damaged
rubber packing or insufficient mounting of the fuel
filter will cause fuel to leak.
Check how heavily the fuel filter is clogged from the
fueling port of the fuel tank every 25 hours of use.
If the fuel filter is clogged with dust, empty the fuel tank,
take the fuel filter out, and clean it with a brush, etc.
If the clogging of the fuel filter cannot be removed or
the fuel filter is damaged, replace it with a new one.
Part No.: Z4551-85100
IMPORTANT
If the fuel filter is clogged, the engine rotation speed
might not increase, or rotation fluctuations might occur.
(1) Rubber packing
(2) Fuel filter
■
SPARK PLUG
WARNING
Do not touch the spark plug with bare hands im-
mediately after stopping the engine. The spark plug
is still so hot and might cause burns.
Take out the spark plug, check the electrodes, and if
contaminated, clean them with a wire brush, etc. every
25 hours of use.
When mounting the spark plug, screw the plug in with
your fingers, and then tighten it with the plug wrench
supplied as a standard accessory.
The spark gap should be adjusted to 0.6 to 0.7 mm.
[Tightening torque]
9.8 to 11.8 N
•
m (100 to 120 kgf
•
cm)
Designated spark plug
Champion : RCJ-6Y
NGK
: BPM7A
IMPORTANT
If you use the plug wrench to start tightening the spark
plug, the thread might become damaged.
■
AIR COOLING VENT
WARNING
Do not put any waste into the intake air-cooling vent
while the machine is in operation. It might touch the
rotating part, causing danger.
Check the intake air-cooling vent and the cooling fin of
the cylinder, and remove any dirt attached thereto every
25 hours of use.
IMPORTANT
If any waste or dirt is jammed between the intake air-
cooling vent and the cylinder fin, the engine might
overheat, causing trouble.
(1) Cylinder fin
(2) Intake air-cooling
vent
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