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1. GENERAL INFORMATION
Troubles Diagnosis
A. Engine hard to start or can not be started
Check and adjustment
Fault condition
Probable causes
Loosen carburetor drain bolt to
check if there is gasoline inside
the carburetor
Fuel supplied tom
carburetor sufficient
Remove spark plug, install it
into spark plug cap, and perform a
spark test against engine ground.
No fuel is supplied to
carburetor
●
No fuel in fuel tank
●
Check if the pipes, fuel tank to carburetor
and intake vacuum, are clogged.
●
Float valve clogged
●
Lines in fuel tank evaporation
system clogged
●
Malfunction of fuel pump
●
Loosen or damaged fuel pump
vacuum hose
●
Fuel filter clogged
●
Malfunction of spark plug
●
Spark plug foul
Check if sparks
Weak sparks, no spark at
all
Perform cylinder compression
pressure test.
●
Malfunction of CDI set
●
Malfunction of AC generator
●
Ignition coil is in open or short circuit
●
Ignition coil leads open or short circuit
●
Malfunction of main switch
Cylinder compression
pressure normal
Re-start by following the starting
procedures
Low compression
pressure or no pressure
●
Piston ring seized
●
Malfunction of cylinder valves
●
Worn cylinder and piston ring
●
Cylinder gasket leak
●
Sand hole in compression parts
No ignition
There are some signs of
ignition; nut engine can
not be started
●
Malfunction of throttle valve operation
●
Air sucked into intake manifold
●
Incorrect ignition timing
Remove the spark plug again
and check it.
Dry spark plug
Wet spark plug
●
Fuel level in carburetor too high
●
Malfunction of throttle valve operation
●
Throttle valve opening too wide
Remove carburetor after 30
minutes and connect a hose
onto fuel rich circuit. Then blow
the hose with air
Blowing in normal
Blowing clogged
●
Malfunction of automatic by- starter
1-14
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