I own a 1995 17 ft Tracker Nitro with a Mariner 115hp, 4 cylinder; S/N - 0G175997. Before this condition I am about to describe the motor would run about 53 mph (gps) @ 5800 rpm. The prop is a three blade (22).
Recently, something change where I now can only run about 39 mph @4100 rpm.
I...
