British sc7 18 exhaust pipe emits black smoke.

On the one hand, the mixture is too thick, the combustion is uneven and insufficient, the throttle valve is dirty, the fuel nozzle is dirty, and there are many fuel impurities. In addition, due to the serious combustion of carbon deposits in the engine and incomplete combustion, a large number of black impurities will be discharged. It is suggested that the throttle valve should be cleaned first, and then fuel additive products should be used to improve the fuel, so that it can be atomized and burned well, which is helpful to clean the oil circuit and engine. Recommend Mufu multi-hall movies