GB-21
BK3420FL-EZ
G
B
10. TroubleShooting
• When the symptoms in the left column do not improve after taking the measures in the right column, please contact the shop
where you bought this product.
• For the measures marked with
�
, please buy ZENOAH’s genuine parts at the shop where you bought this product.
PHENOMENON
The engine does not start.
The engine does not accelerate.
The engine stop when the throttle
is returned to its original position.
The engine rotation speed changes.
Abnormal vibration
Deterioration of fuel consumption
MAIN CAUSE
• Bad fuel (different quality, deterioration)
• Excessive sucking of fuel
• Clogging of the muffler exhaust vent
• Contamination of the spark plug electrodes,
Short-circuit or breaking of a wire
• Bad fuel (different quality, deterioration)
• Clogging of the muffler exhaust vent
• The idling revolution speed is too low.
• Clogging of the fuel filter
• Deformation or damage of the blade
• Clogging of the air cleaner
• Blunt blade
• Bad lubrication of the flexible shaft
MEASURES
• Replace it with normal fuel (page 13).
• Open the choke, open the throttle full
open, and pull out the rope repeatedly
(page 14).
• Clean the muffler (page 18).
• Clean the electrodes or replace the plug
(page 19
�
).
• Replace it with normal fuel (page 13).
• Clean the muffler (page 18).
• Readjust the idling adjustment screw
(page 18).
• Clean or replace the fuel filter (page 19
�
).
• Replace the blade (page 20
�
).
• Clean the air cleaner (page 19).
• Replace the blade (page 20
�
).
• Supply grease (page 18).
WARNING
• Do not modify or disassemble the machine. Modification or disassembly of the machine might cause the
machine to be damaged during operation, or cause an unexpected accident due to the leakage of fuel
or malfunction of the machine.
• When you carry out inspection or maintenance of the machine, keep the machine clear of fire (such as
a lit cigarette). Otherwise, the fuel might catch fire.
• Use ZENOAH’s genuine or dedicated tightening parts (bolts, nuts and screws). Use of other manufactur-
ers’ parts might damage the machine, or cause an unexpected accident due to parts falling off while the
machine is in operation.
11. Disposal
• When you dispose of the machine, do not disas-
semble the machine.
• When you dispose of the machine, fuel, oil, be sure
to follow your local regulations.
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