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IV. DISASSEMBLING AND SERVICING
4-1 Troubleshooting
4-1-1 Starting difficult
TROUBLE CAUSE REMEDY
There is no enough fuel in fuel
tank and fuel cock is closed.
Fill fuel, open fuel cock.
Air vent in the fuel filler cap is
clogged
Dredge air vent.
Improper or clogged carburetor
main fuel channel.
Readjust or clean, blow to get through.
Carburetor float needle valve is
not closed properly or start hole
is clogged.
Dismantle needle valve and repair,
clean, blow to get through.
Fuel supply
is not
smooth or
no fuel
supply.
Carburetor float is damaged or
sticking.
Repair float
Fuel is too filthy or deteriorated Replace
There is water in fuel.
Replace
Too much fuel in cylinder.
Drain extra fuel, dry up spark plug
electrodes.
Normal
spark
plug
spark
Something
wrong with
the fuel
system.
Fuel
supply is
normal.
Wrong fuel brand
Select proper fuel brand corresponding
with the requirements.
Too much carbon deposit and
dirt around electrodes.
Clear away.
Electrodes are burn damaged
seriously or insulators damaged.
Replace spark plug.
Normal high
–
tension line
spark.
Spark
plug is in
bad
conditions
Improper electrodes gap.
Adjust to proper value.
High –tension line is damaged. Replace
Ignition coil is damaged.
Replace
Magneto loses magnetism. Replace
Normal
cylinder
compression
Normal
fuel
supply
system.
High-
tension
line no spark
Normal
spark
plug
Abnormal gap between the
ignition coil and flywheel.
Adjust gap
TROUBLE CAUSE REMEDY
Piston ring is worn to or even over
its wear limit
Replace
Piston ring is broken. Replace
Piston ring is sticking. Clear up carbon deposits
Spark plug is not tightened or
without a gasket.
Tighten with a gasket in.
Check cylinder gasket, and the flatness
of the surface by which cylinder block
contacting with cylinder head.
Air leakage between cylinder
block and cylinder head.
Tighten cylinder head bolts in
stipulated order to stipulated torque.
Abnormal
cylinder
compression
Normal
fuel supply
system
Normal ignition
system
Air leakage in the valves
Check, clearance and tightness,
repair if necessary.