Engine failure, can focus on the above four aspects, check, analyze the cause of the failure, and to eliminate.
Fault performance
Inspection method
Inspection result
Possible cause
The engine will not start
or has difficulty starting
Check for fuel flow into
carburetor
No fuel flow into the
carburetor
No fuel in the tank
The fuel line from tank to
carburetor is blocked
Fuel flows into the
carburetor
The float assembly in the
carburetor is stuck
The vent on the tank cap is
blocked
Remove the spark plug to
test the spark
The spark is weak or
completely absent
Spark plug failure
Spark plug is not clean
The electronic ignition is
faulty
The magneto is out of order
The spark is good
The connection is bad and
broken
The high-voltage cable is
disconnected
or
short-circuited
The
ignition
coil
is
disconnected
or
short-circuited
The ignition switch is faulty
Test cylinder pressure
The pressure is too low
The starting mechanism
skidded and failed to turn
the engine
The pressure is normal
Valve clearance is too small
Valve opening blocked
Cylinder or piston ring wear
The cylinder head gasket is
broken
Improper valve timing
Restart the engine
The engine ignites but
will not start
Choke opens too large
Carburetor trimmer screw
not properly adjusted
Engine failure
Air intake pipe leaks
Incorrect ignition timing
Remove the spark plug
The spark plug is
damp
Carburetor oil level is too
high
The carburetor choke closes
too tightly
The spark plug is dry
The throttle is too high
The engine performs
poorly at low or idle
speeds
Check valve timing and
valve clearance
incorrect
Improper adjustment of
valve clearance or poor
quality of rocker arm
adjustment screw
correct
Improper
valve
timing
adjustment
Check the adjustment of
carburetor
plunger
trimmer screw
incorrect
Incorrect adjustment
Summary of Contents for TD125
Page 1: ...KAYO MOTO TD125 SERVICE MANUAL www kayomoto com...
Page 24: ...h e c k t h e c a r b u r e t o r i d l e s p e e d R e p l a c e t h e a i r lt e r C h e c...
Page 28: ...i n g s f o r c r a c k s l e a k s a n d i n c o r r e c t w i r i n g C h e c k c l u t c h...
Page 32: ...h a i n s h a n d l e s e t c a n d c h e c k f o r s m o o t h o p e r a o n C h e c k c h a...
Page 34: ...c h a i n g u i d e a n d c h a i n c o v e r C h e c k s p o k e t e n s i o n C h e c k t...
Page 35: ...h e r i m C h e c k f o r r i m e d g e r u n o u t C h e c k if t h e r i m b e a r i n g i s...
Page 40: ...s y s t e m s e t u p C h e c k t h e c o m p r e s s i o n a n d r e b o u n d o f t h e...
