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Air filter is blocked so there's not enough air input. There is a problem with motorcycle sprocket, like idling air inlet congestion, then the air input just isn't enough. The oil amount of float chamber is too high, some gasoline go directly into the cylinder without atomization, that may cause incomplete combustion. Main orifice wearout seriously and then this fuel injection from primary nozzle increases, that may cause incomplete combustion. Heating automatic valve is at start position along with the enrich valve can't be closed automatically, that can caused a wealthy mixture. Carbon deposit in muffler, exhaust jam, waste gas stay in cylinder, that can caused incomplete combustion then black smoke. Anxiety in lay man’s term means uneasiness, discomfort and nervous reaction leading to fear. Excessive anxiety can result in anxiety. It might lead to stomach aches, short breaths, nausea, chest pains, irregular heartbeats, frequent urination, muscle tension,slaapproblemen (sleeping problem), excessive sweating and trembling. Depression alternatively is often a much more of a psychological problem. It’s your response to any kind of loss or misfortune. It is the mind-set where people experience deficiency of energy and interest to do any pursuit, have pessimism, remain gloomy and sad, discouraged and show low self confidence.