J
Jon Zaimes
Recently the Yanmar 1GM10 in our '80 Hunter 27 has been sluggish under load. In neutral it easily reaches the top RPM (3600) with plenty to spare. But in forward at full throttle it tops out at about 2800 RPM. Oddly, in reverse it will reach full RPMs without any problem. Exhaust appears to be spewing some black stuff into the water when under full load. Engine starts OK and runs OK. Have just checked the air filter and changed the fuel filter. Also have just brushed the hull so it is reasonably clean (at least as far down as the brush reaches). She seems to be moving along fine under sail.Ideas?Jon Zaimes"Airwaves" sailing out of Cambridge, MD.