I have a 1984 J140TLCR 140hp Johno. I have had it since new on the back of the Haines. Last year I had a partial rebuild. I dropped rings in 1 cylynder and scored the bore quite bad.
I pulled the power head off and a mate did the work. It would not hone out so he had 1 cylinder bored
1 oversized piston and rings new rings for the other 3 cylinders, bearings, new waterpump housing & impeller,Gaskets, fuel pump, Thermostats totaled out at $1600.00.
The old girl is going as good as the day I got her.
In April I had her up a Nelsons Bay for the Trailer Boat Comp 95 klms in 1 day did not miss a beat.
Pete