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The black exhaust Black seems to be a depressing color. The reason must be rich mixture. That is to say, the amalgamation of gas in cylinder component is at night normal level. The incomplete combustion gas inside combustion chamber result in the carbon particle exhausted with the waste gas. Failure is likely to come from the following reason: The black exhaust Black is apparently a depressing color. The reason should be rich mixture. That is to say, the mixture of gas in cylinder component is after dark normal level. The incomplete combustion gas within the combustion chamber make the carbon particle exhausted using the waste gas. Failure may well come from the following reason: Air filter is blocked so there isn't enough air input. There is a downside to motorcycle sprocket, like idling air inlet congestion, then this air input isn't enough. The oil level of float chamber is simply too high, some gasoline go directly into the cylinder without atomization, which will cause incomplete combustion. Main orifice wearout seriously and then the fuel injection from primary nozzle increases, that can cause incomplete combustion. Heating automatic valve is start position along with the enrich valve is not closed automatically, that will caused a wealthy mixture. Carbon deposit in muffler, exhaust jam, waste gas stay in cylinder, that can caused incomplete combustion then black smoke.