I have a 2007 Mainship Pilot 34 with a Yanmar 6lya-stp 370 HP engine, about 1430 hours. In neutral at 2000 rpm, after the engine is warmed up to 175 degrees F, it puts out a lot of white smoke, it not noticeable underway. In addition, at low rpm, there is a fuel exhaust sheen in the water at...