My son's buddy came down to the keys for a week of fishing,soon after leaving the dock 1st day enging overheated.I was in the business back 10 yrs ago ,so I offered to help.!st thing I found was a broken impeller.The HUB broke and to my suprise it was plastic.Replaced with genuine yammy and was suprised it too is plastic hub.Was yammy always plastic and I didnt notice??is this a common problem?and does anyone make a STRONGER impeller?Ok I get her back together,the engine is clean clean.Put the muffs on to check shifting and pumping.NO water from pee hole.Damn,try flushing the pee hole,all clean.Try running again.No better,in fact after a few minutes the heat horn goes off.Pulling my hair out,I drop the gearcase again.Now the problem was OBVIOUS,broken hub on impeller,how easy can it get.Check everything.Put back together,no change.I make a few calls.One friend a mech.said put it in the water,it will be fine.He was right.pumped great.Now I want to know WHY.After all,Im sending water to the pump,under pressure and cant get a pee.Enlighten my guys,Ive been away from outboards to long to know the secrets.
