LONCIN LC2V80FD - Abnormal Exhaust Colors of Engine

Part IV Faults Diagnosis
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4-4 Abnormal exhaust colors of engine
(Refer to Section 3-2)
(Refer to Section 5-2-9)
(Use new fuel oil of specified quality)
(Use new fuel oil of specified quality)
(Normal starting)
(Alleviate load)
(Refer to Section 5-2-4)
(Clean air filter)
Abnormal
exhaust color
Black
White
Fault of carburetor
Overloaded
Air filter excessively dirty
Low temperature of engine
Water contained in fuel
Engine oil contained in fuel
Excessive wear of cylinder/piston/piston ring
Too much engine oil added
Blue
(Refer to Section 5-2-7)
Fault of cylinder head