85
⑤
Magneto problem
Change
Engine middle
and high
rotate speed is
uneven
Mechanical
problem
①
The force of Valve spring is
weak.
②
Cam axle worn out
③
Plug is dirty.
④
Gap of plug is too small.
⑤
Air circulation is not right.
⑥
Ignition loop problem
⑦
Air filter is dirty.
⑧
Block in fuel pipe cause fuel
supply problem
⑨
Fuel pipe problem
⑩
Underpressure in hight-pressure
fuel pump
Change
Change
Clean or Change
Adjust or change
Adjust or change
Change
Clean or change
Clean
Change
Adjust or change
Exhaust blue
smoke
Mechanical fault
①
too many lube
②
Piston ring worn out
③
Valve pipe worn out
④
Cylinder wall scratched
⑤
Valve rod worn out
⑥
Seal of valve rod broken
Drain the extra lube
Change
Change
Change
Change
Change
1. Fuel supply
system fault
①
Blocked in muzzle of throttle
body
②
Air filter is dirty
③
Leakage on air intake pipe
Clean or change
Clean or change
Tighten or change
Drain the extra lube