im helping out a friend of mine with a rebuild on a 2003 opti saltwater series he just purchased.
the powerhead needs two starboard pistons(#859563t 4).we are having trouble locating the right p# that corresponds to the mercury p# for this particular engine.it is listed as a 2.5 dfi motor so are the 135,150 ,and 175hp pistons the same?if so,where does the horsepower increase come from?i know there are ALOT of guys on here that know these black motors inside out,so help out my ADHD buddy please as he just does not have the patience to sit down and research these things!