Answer / amitesh ranjan

Unburnt carbon

Answer / rohit kumar

There is many cause of black smoke.

1.is unproper mixture of fuel supply by carburetor like
very rich mixture so the fuel unpropr burn.

2. il is when piston or piston ring is fail so back side
cooling oil relise in combuction chamber it cause black
smoke.

3.unproper ignition systam like not siffecient time of
pressure rise delay period .

rohit kumar (suzlon energy)

Answer / ram

carbon

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