Re: 81 Evinrude 150 Piston and cylinder
First consider the motor.its an 1981.Is it a super clean freshwater used engine with NO other problems.If so.You MIGHT want to rebuild.If you can do a snowmobile ,its easy enough.Having it bored may cost about $100.A sleeve needing to be replced ,200 250.It requires boring old sleeve out,installing a new costly sleeve and more machine work.Yes you can do one cyl.BUT,the engine needs to be totally stripped for machine work.At that point,a 81 engine likely has wear elsewhere,meaning 6 new pistons at at least 100 a PIECE,there are different after mkt. companies.then berings,gaskets oh and boring the other 5 holes,.you can look on the iboats website for remanufactured powerheads.But ,its still a few grand.You might do better to buy a good ,clean freshwater preferred engine for half the price of the rebuild.Its the material in this case that will cost you.In the end you still have a 1981 eng.if you keep it ,you know what you got .But how is the lower unit,trim and tilt?The 150 are great engines.