I have a heavy boat and on a 13inch prop just get to 5150 min RPM range, I am going to get an 11inch prop and this should stop the lugging? My prop has a lot of soot on it and i have been reading up in the causes of this which seem linked to the lack of revs. Should I worry about the soot in the block and what should i do to remove the carbon. i wonder if the guru or some other kind person can respond please. Hours are under 150 so should i be worried? as it is running ok. I use rock oil mp3 semi synth oil.
thanks
thanks