Re: 159 hp force
It is a difficult call: It really depends upon the sale price. For example: I bought one with two bad cylinders for 300 bucks. The pistons broke rings (which these engines will do more than usual) but did not score the cylinders so I did not need to bore them. Thus, I was able to replace the pistons without doing a complete tear-down and rebuild.
I never liked the 5 cylinder concept and stayed away from the 150s until this one came along at a price too juicy to resist. The engine has converted me, delivering 10 MPH more than the Chrysler 140 it replaced. Yeah, I would buy another.
Generally speaking, if the price is right and you are not afraid to do the work yourself, it is worth rebuilding as long as the damage is confined to pistons and cylinders.
These engines are way more powerful that the Force 120 and 125 four cylinder engines and will make them look sick.
The only weak point I can think of is the starter. The same starter is used on the three, four, and five cylinder engines. If your battery is marginal, it simply will not crank the engine.
So, if you can supply a little more info, I can give you a more definite answer.