KEEWAY FACT 50 4T Maintenance Manual page 23

Diagnosis on power shortage of engine
Flexible
of wheels
Check
pressure
Low pressure
Check whether air
occurs to tire valve and whether
tire is pierced or broken
Touch with your fingers and you can
feel fierce air rushing out with puffing
sound.
Normal
pressure of cylinder
Start the engine and slowly accelerate;
observe the rotation speed change of
engine.
The rotation speed of engine rises as it
slowly accelerates.
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.
Power shortage of engine
Raise the main kickstand and suspend wheels; rotate
wheels with hands
rotating
tire
Normal
pressure
leakage Remove the spark plug and block the threaded
hole with finger; press the startup button or
step on the kick-start lever
compression
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 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.
Y
23
Inflexible rotating of
wheels
1. Check whether there is braking
drag.
2. Check whether wheel bearing
is excessively
damaged.
3. Check whether the middle
sleeve of hub is missed or too
short.
Touch with your fingers and you can not
feel fierce air rushing out.
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
cylinder.
N
1. Check whether CDI
ignition device is in
good condition
2. Check
flywheels and trigger
coil are loosened
abraded or
and the
whether