23
Y
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Diagnosis on power shortage of engine
Power shortage of engine
Raise the main kickstand and suspend wheels; rotate
wheels with hands
Flexible rotating
of wheels
Inflexible rotating of
wheels
Check tire
pressure
1.
Check whether there is braking
drag.
2.
Check whether wheel bearing
is excessively abraded or
damaged.
3.
Check whether the middle
sleeve of hub is missed or too
short.
Low pressure
Normal
pressure
Check whether air leakage
occurs to tire valve and whether
tire is pierced or broken
Remove the spark plug and block the threaded
hole with finger; press the startup button or
step on the kick-start lever
Touch with your fingers and you can
feel fierce air rushing out with puffing
sound.
Touch with your fingers and you can not
feel fierce air rushing out.
Normal compression
pressure of cylinder
Insufficient compression
pressure of cylinder
1.
Check leakage on outer
connections of the engine.
2.
Check whether the piston
ring is ruptured or seized
in the groove or whether it
has enough elasticity.
3.
Check abrasion of the
piston ring and the
cylinder.
Start the engine and slowly accelerate;
observe the rotation speed change of
engine.
The rotation speed of engine rises as it
slowly accelerates.
The rotation speed of engine does not rise
as it slowly accelerates.
Check whether ignition is timely
conducted with an ignition timing
lamp.
1.
Check whether the clutch is slipping.
2.
Check whether the driving belt is
excessively abraded.
3.
Check whether the centrifugal roller of
driving pulley is excessively abraded.
4.
Check whether the conical surface of
driving wheels and friction wheels is
excessively abraded or abraded to be
groove.
5.
Check whether the conical surface of
driven wheels and moving driven wheels
is excessively abraded or abraded to be
groove.
6.
Check whether the raceway on the inner
surface of friction wheels is excessively
abraded or pressed to be concave.
1.
Check whether the fuel supply system
works normally.
2.
Check whether the carburetor, air filter
and exhaust muffler are blocked.
3.
Check whether the vacuum diaphragm
of plunger valve of carburetor is
cracked or broken.
1.
Check whether CDI
ignition device is in
good condition
2.
Check whether
flywheels and trigger
coil are loosened
