Yingang YG125-25, Maintenance Manual

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YG125-25 Maintenance Manual Engine management system
Check whether the timing is right
Yes Next
No Adjust the timing
Check whether there is leakage of the valve
Yes Adjust the valve
No Next
Check whether the injeoctor is blocked.
Yes
Clean or change the
injector
No Next
Check whether the oxygen sensor works well
Yes Help
No Change the sensor
M
is
s
f
ir
e
Pull out the spark plug, check whether the sparkover is normal.
Yes Next
No Check the ignition system
Check whether the timing is right
Yes Next
No Adjust the timing
Check the typ and the clearance of the spark plug.
Yes Help
No Change the sprk plug
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