Significance of Carbon in exhaust: 115 HP Four Stroke

[SeaKaye12]

My neighbor just got back from lobster diving;and when we went to flush the engines in the driveway we noticed black carbon residue floating on top of the water running down the curbside. That is unusual....not seen typically; at least not in that quantity.

What does that siginify? A missing cylinder perhaps? Issues with the fuel injection? Burning crankcase oil?

These are twin Yahama 115's.....appx 5-6 years old and otherwise runnng fine.

Thanks folks, Chuck

 

[JUSTINTIME]

Re: Significance of Carbon in exhaust: 115 HP Four Stroke

take a look at the plugs, they will tell u