Generic Onyx 50, Service Manual

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Diagnosis on excessive fuel consumption of engine
Check and adjust the carburetor.
Excessive fuel
consumption of engine
Check whether operation is
correct
Raise the main kickstand and rotate
wheels with hands 1. Check whether motorcycle runs
with overload or not at
economical speed or with low
gear.
2. Check whether petrol grade is
proper.
Inflexible rotating of
wheels Flexible rotating
of wheels
1. Check whether
there is braking
drag.
2. Check whether
wheel bearing is
seriously abraded or
damaged.
3. Check whether the
spacer sleeve of hub
is missed or too
short.
Check tyre
pressure
Low pressure Normal
pressure
Inflate as required Check whether oil leakage occurs
in fuel box, fuel cock, oil pipe
and carburetor.
Solve problems based on
actual situation Check the proportion of
mixed combustible gas.
Normal combustible gas mixture
Mixed combustible
gas is too dense.
Mixed combustible
gas is diluted.
Check whether the idle speed
of engine is too high. 1. Check whether the air filter
is blocked.
2. Check whether the
carburetor float is too low.
3. Check whether the main
measuring jet of carburetor
is too big.
1. Check whether the
carburetor is blocked
inside.
2. Check whether the
carburetor float is too
high.
Check and adjust the
carburetor. Check whether ignition is
timely conducted with an
ignition timing light
Check whether the
driving belt of clutch is
slipping. Check the ignition
system.