We just completed sea trials for what will likely become our new boat. One of the items that the surveyor pointed out was that the 27hp Yanmar did not reach maximum rated RPM under load (while under way)and was concerned that the prop was oversized. We saw some blue smoke while motoring at max RPM. We turned about 3400 RPM at max throtle under load and about 3900 RPM in neutral. This was confirmed with a strobe. The boat is equipped with a three blade prop, that I am told is the standard for that boat. The boat is a 1998 model. The motor is clean and looks to be in good condition. Can anyone tell me if this is normal or if you have had similar problems? Thanks, Larry