AGM 520 E, Original User Manual

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AGM 520 E (GB)
TROUBLESHOOTING GUIDE
1. ENGINE WILL NOT START
Symptoms Likely cause Solution
Normal
compressi
on
pressure in
the
cylinder
Normal
spark of
the spark
plug
Fuel system abnormality No fuel in the tank Add fuel in the tank
Fuel filter clogged Clean the fuel filter
Normal
fuel
system
Fuel
Fuel is too dirty Replace the fuel
Water present in the fuel Replace the fuel
Too much fuel in the cylinder Remove the spark plug and dry it
The wrong fuel mixture ratio Make proper mixture
Normal
fuel
system
Normal
high-
voltage
cable of
the spark
plug
Spark
plug
Spark plug dirty with oil deposits Clean oil deposits
Damaged insulation of the spark plug Replace the spark plug
Clearance is too small or too big Set spark plug clearance to 0.6-
0.7mm
High-voltage spark plug
cable abnormality High-voltage spark plug cable cracked or
broken Replace or tighten
Coil loose Tighten
Fuel
system
normal Normal
ignition
system
Inadequate compressive
stress
Piston ring worn out Replace with a new one
Piston ring cracked Replace with a new one
Piston ring stuck Remove
Spark plug loose Tighten
Leakage at the joint of the cylinder and
the carter Remove
Normal compression
Poor contact at the connection of the
spark plug and the high-voltage cable Tighten spark plug cap
The stop switch defective or there is a
short circuit
Repair or replace
2. POOR OUTPUT POWER
Symptoms Likely cause Solution
Shutting down on acceleration Fuel filter clogged
Fuel is running out
Oil deposits in the exhaust pipe Clean the fuel filter, clean the fuel lines
Adjust the carburetor
Clean oil deposits
Low compression Piston, piston ring, cylinder worn out Replace the piston, piston ring
Engine leaks Leakage at the joint of the cylinder
and the carter Repair
End of the crankshaft leaks Poor sealing Replace the seal
Engine overheating
Oil deposits in combustion chamber Avoid continuous use, high speed and high loads.
Clean the oil deposits