KEEWAY F-ACT EVO Instruction & Maintenance Manual page 23

Failure diagnosis procedure of engine's excessive fuel consumption
Prop up the main jiffy stand and revolve wheel by hand
Wheels revolve difficultly
1. Check if the brake
drags
2. Check if the wheel
bearing is overused
3. Check if the loading
of hub's central spacer
is neglected or shorter
To exclude in accordance with the actual situation
The mixture ratio of the combustible
gas mixture is normal
Check if the engine idle speed is too high
Yes
Check and adjust the
carburetor
Yes
Check if the transmission
belt of clutch slips
Excessive fuel consumption of engine
Check if the operation method is right
Yes
Wheels revolve smoothly
Tire pressure is too low
To charge as required
Yes
Combustible gas mixture is too strong
No
Use ignition timing
light to test whether
engine ignition is
timing
Check the tire pressure
Tire pressure is normal
Check there is fuel leaking in
the fuel tank, fuel cock, fuel
pipe and carburetor
Check the mixture ratio of the
combustible gas mixture
1. Check if the air cleaner
blocks
2. Check if the carburetor
float is too low
3. Check if the main jet of
carburetor is too large
No
Check ignition system
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No
1. Check if the motorcycle is run
overloaded, or run not
economical speed or run at low
gear
2. Check if the gasoline number is
right
No
Combustible gas mixture is too weak
1. Check if the inside of
carburetor blocks
2. Check if the carburetor
float is too high
at