- 20 -
Yes
No
Underpowered engine failure diagnosis procedure
Engine underpowered
Prop up the main jiffy stand to make the wheels
lift-
off, revolve wheel by hand
Wheel spins smoothly
Wheel spins stiffly
Check the tyre pressure
1. Check if the brake drags
2. Check if the wheel bearing is
overused or damaged
3. Check if the loading of hub’s
central spacer is neglected or
shorter
Air pressure too low
Air pressure normal
Check if the tire valve core
leaks and if the tire breaks
Remove the spark plug and block the spark
plug threaded hole with hand, then press the
starting button or step on the starting bar
quickly
Fingers can feel a strong gas blowing
outside, with the sound of pow at the
same time
Fingers can not feel a strong gas blowing outside
Cylinder compression pressure normal
Cylinder compression pressure insufficient
1.
Check if there is gas
leaking
in
external
connections of the engine
2.
Check if the piston ring
sticks in ring groove or
insufficient elasticity
3.
Check the wearability of
piston ring and cylinder
Start the engine and step on the gas
slowly to watch the change of
engine’s rotating speed
The rotating speed of the engine accelerates
as the driver step on the gas
The rotating speed of the engine does
not accelerate as the driver step on the
gas
1. Check if the clutch skids
2. Check if the transmission belt is over worn
3. Check if the centrifugal roller of the
driving pulley is over worn
4. Check if the conical surfaces of driving
wheel and moving friction wheel are over
worn or worn into groove
5. Check if the conical surfaces of following
pulley and moving following pulley are
over worn or worn into groove
6. Check if the roller track on the internal
side of moving friction wheel are over worn
or extruded into a drop pit
1. Check if the supply of fuel feeding
system is smooth
2. Check if the carburetor, air cleaner and
exhaust muffler block
3. Check if the vacuum diaphragm of
carburetor plunger valve cracks or
breaks
4. Check if carburetor float height is
improper
1. Check if the CDI
ignition apparatus fails
2.
Check
if
the
magneto flywheel and
trigger winding loosen
Use ignition timing light to test
whether engine ignition is timing
Содержание F-ACT EVO
Страница 1: ...Two wheeled Motorcycle F ACT EVO User s Instruction and Maintenance Manual KEEWAY Motorcycle Co Ltd...
Страница 11: ...10 Figure 1 5 Figure 1 6 Figure 1 7 Figure 1 8 Figure 1 9 Figure 1 10 Handle Figure 1 11 Figure 1 12...
Страница 16: ...15 QJ50T 21T...
Страница 109: ...108 Check and maintenance of the engine...
Страница 136: ...135...
Страница 142: ...141 Function it is a transmission torque and could determine the final output torque and speed...
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