76
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 Underpressure in hight-pressure
fuel pump
⑧ Air filter is dirty.
Change
Change
Clean or Change
Adjust or change
Adjust
Change
Adjust or change
Clean or change
Exhaust blue
smoke
Mechanical fault ① too many lube
② Piston ring worn out
③ Valv e p i p e wor n o u t
④ Cylinder wall scratched
⑤ Valve rod worn out
⑥ Seal of valve rod broken
Drain the extra lube
Change
Change
Change
Change
Change
Engine power
is not enough
① Dirt on plug
② Gap of plug is not correct
③Inlet air hose is leak
④Valve base is not suitable
⑤ Air filter is dirty
Clean or Change
Change or Adjust
Tightening or Change
Change
Clean or Change
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