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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 tyre 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 tyre valve and
whether tyre 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.
1.
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.
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.
4. 检查化油器浮子高度是否不当
1.
Check whether CDI
ignition device is in
good condition
2.
Check
whether
flywheels and trigger
coil are loosened
Check whether ignition is
timely conducted with an
ignition timing lamp.
