HP questions for rebuilt Evinrude 55S

[Spivy30]

I have a 1979 Evinrude 55hp motor that was rebuilt before I bought it. It was bored .30 over and has 155lbs of compression in both cylinders, my question is how much HP is this motor pushing out now? Runs great and pushes my 16' mirro craft great.

 

[Dhadley]

Re: HP questions for rebuilt Evinrude 55S

We'll assume it was bored .030 over but to answer the question, it's still putting out the same hp as it was when it was manufactured. Whether you measure it at the flywheel or at the prop, it'll be within the NMMA's guidelines for published hp using that method.