Re: rebuilding 115 hp Evinrude is more power available?
Yeah you have to do some machining to the ports, intake and exhaust, and some other very maticulous stuff, you really have to know what your doing and basically need a machine shop. I have also heard that even though the 115 - 140 are the same block, that a lot of guys who have switched from a 115 to a 140 are not happy with the low end torque the 140 provided, you may get a little bit more on the top end, but your hole shot will suffer. Not really sure of the reason. I think that OMC used to just rate the basic same engine at different RPM, even though they make the basically the same HP. Like a 115 makes 115hp at 5500, but a 140 makes 140hp at 5200, something like that, not the real numbers but basically they rated them differently for marketing purposes, at least that's what I have been told, I'm sure some experts here will know the real story if it's incorrect.
