Symptom: Too much fuel consumption by the engine Diagnosis procedures
Too much fuel consumption
Check operation method
Lift it by main stand, rotate wheels by hands
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.
Wheels rotate inflexibly
.
Wheels rotate freely.
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.
Check tire pressure
Air pressure too low
Air pressure normal
Gas up as specified.
Check if fuel tank, fuel switch, delivery pipe
or carburetor leaks oil.
Exclude as practical situations,
Check mixture ratio.
Mixture ratio of air/fuel is normal.
Air/fuel concentration is too high.
Air/fuel concentration is too low
.
Check if idle speed of engine 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.
1. Check if carburetor
is clogged inside; 2.
Check if float is too
high.
Check and adjust
carburetor.
Use an ignition timing lamp to
check ignition timing of engine
Check if transmission belt
of clutch slips.
Check ignition system.
Yes
No
No
Yes
Yes
No
Yes
No
