18
4-1-4 Unable to Ignite
Phenomenon
Cause
Remedy
Unable to Ignite
Fuel
supply
system
Fuel used up
Refuel
Carburetor is clogged
Check oil way and dredge it
Fuel leakage of float
chamber
Repair float needle valve
Needle valve is stuck
Disassemble the float
chamber, and remedy the
trouble
Ignition system
Spark plug is broken
through with carbon
deposit and short circuit
Replace the spark plug
The side electrode of the
spark plug fell off
Replace the spark plug, and
remove fallen object
Falling-off of HV line
Re-welding
Breakdown and short
circuit of ignition coil
Replace the ignition coil
Shutdown line is placed on
the body
Find short circuit point and
re-insulate
Other
Severe cylinder scraping,
falling-off of the valve
Repair and replace damaged
parts
4-1-5 Overheating of general-purpose gasoline engine
Phenomenon
Cause
Remedy
Gasoline engine
overheating
Insufficient oil
Fill sufficient oil
Exhaust port is blocked
Clean exhaust port
Leakage of air deflector
Repair damaged place
Sundries blockage in the middle of cooling
fins
Clean cooling fins
Deformation of connecting rod causes the
wears of the piston and cylinder liner edge
Replace the connecting rod
Wears of cylinder, piston and piston ring
causes air leakage between cylinder and
crankcase
Replace worn parts
Gasoline engine governor is improperly
adjusted, causing the speed to be too high
Re-adjust the governor
