We bought our boat about 16 month ago and it has a 2GM20F fitted.
Last week for the first time I tried to full throttle the motor
to see what it does.
We get a big cloud of black smoke behind us and can smell the sud . It leaves a black cloud on the water
too with is not oil
, it looks like carbon.
When I back the throttle off to about 2300rpm all is back to normal.
I wonder if the motor
hasn't been run at full throttle for a long time and is just burning off crap or could it be something more than that?