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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. Today, wedding bands are worn by men and women. It is considered as the symbol of love and dedication to each other. The history of men?s wedding ring just isn't as old because women?s ring. During World War II, men needed to leave their wife and grow from them in the battle fields for too long time. In order to keep the sweet memory of the wife with these, men started wearing rings. Later, the exchange of ring during marriage ceremony was introduced. And it is practiced till today. Men and women both wear rings nowadays.