KEEWAY RKV125 Instruction And Maintenance Manual page 25

Symptom: Too much fuel consumption by the engine
Lift it by main stand, rotate wheels by hands
Wheels rotate inflexibly.
1. Check braking
drag; 2. Check if
bearings of wheels
are over worn or
injured; 3. Check if
middle spacers in
the hub are missed
or shorter.
Exclude as practical situations,
Mixture ratio of air/fuel is normal.
Check if idle speed of engine is too high.
Yes
Check and adjust
carburetor.
Check if transmission belt
of clutch slips.
Yes
Air pressure too low
Gas up as specified.
Yes
No
Use an ignition timing lamp to
check ignition timing of engine
Yes
Too much fuel consumption
Check operation method
Wheels rotate freely.
Check tire pressure
Check if fuel tank, fuel switch, delivery pipe
or carburetor leaks oil.
Air/fuel concentration is too high.
1. Check if air cleaner is
clogged; 2. Check if float
of carburetor is too low;
3. Check if main jet of
carburetor is too big.
No
Check ignition system.
Diagnosis procedures
No
1. Check if motorcycle is driven
over speed or not at economical
speed or driven at low gear; 2.
Check if gasoline grade being
used is correct.
Air pressure normal
No
Check mixture ratio.
Air/fuel concentration is too low.
1. Check if carburetor
is clogged inside; 2.
Check if float is too
high.