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20
Roller bearing for crankshaft main
shaft is worn
Replace roller bearing
Engine is too hot Shoot trouble
Too much carbon deposit in
combustion chamber
Clear away
Abnormal combustion
Improper gasoline brand or low
gasoline quality
Replace with qualified
gasoline
There is water in float chamber Clean
Improper spark plug electrodes
clearance
Adjust
Incorrect ignition time Readjust
Engine cannot start
because of spark
lacking
Something wrong with induced coil,
and so on
Check and replace
damaged parts
IV. STOP SUDDENLY WHEN RUNNING
TROUBLE CAUSE REMEDY
Fuel is used up Refill fuel
Carburetor is clogged Check fuel line and dredge
Float is leaking Repair
Fuel supply
system
Needle valve sticks
Dismantle float chamber
and criminate it
Spark plug is struck
through, or
short-circuited by carbon
deposit
Replace spark plug
Side electrode of spark
plug is dropped out
Replace spark plug
High-pressure wire is
dropped out
Weld on
Ignition coil is struck
through to be
short-circuited
Replace ignition coil
Ignition system
Parking wire is located
on engine body
Find out meeting and
insulate
Stop suddenly
when running
The other
Cylinder is pulled
damage, valve is
dropped out
Repair or replace damaged
parts
V. GASOLINE ENGINE IS EXCEESIVELY HOT
TROUBLE CAUSE REMEDY
Improper ignition time Adjust ignition advance angle
properly
Insufficient fuel supply Refill engine oil
Exhaust pipe is blocked up Dredge exhaust pipe
Gasoline engine is
excessively hot
Flow guard is leaking Repair damaged part
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