I have a 1998 150 evinrude intruder carbed version. I have posted a few powerhead issues here and wondering why I need a new powerhead as the service guys say. The starboard center cylinder is scored. I guess from a bad carb? I don't know. The other cylinders still have honing marks( on that side) Couldn't I just have that cylinder rebored and a new piston, or while its out have them all redone and a new set of oversize pistons. I'm guessing $250 for pistons and $450 to rebore the cylinders? after a new water pump impeller and rebuult carbs maybe have $1000 in it?